MLB players use ProLine Balls because they need training tools that can handle elite-level velocity, high-volume reps, and game-like consistency without sacrificing accuracy or durability. ProLine Balls were developed using direct feedback, requirements, and ongoing R&D from professional players and organizations to create a training ball that performs at the highest level.

Players trust ProLine because our balls provide:

• Consistent and accurate pitch flight
• Reliable performance at high velocities
• Reduced vibration and sting on contact
• Safer, high-volume reps with less wear on the body
• The ability to train breaking balls, spin, and pitch recognition effectively
• Long-lasting durability for daily professional use
  

Unlike many traditional training balls, ProLine Balls are engineered to respond consistently in pitching machines while still challenging hitters with realistic movement and timing. The lightweight foam design also exaggerates mishits, forcing players to develop cleaner mechanics and more precise barrel control.

From MLB organizations to college programs and high-level facilities, players use ProLine because every rep matters — and they want a ball built to match the demands of elite training.

The No Seam ball is extremely accurate due to the absence of irregularities and is intended for high velocity without injury or inconsistency. The Seam ball has variability in movement due to the embossed seams by design. Best for off-speed pitches, catcher drills, or a more challenging fastball.

Training with a 7.5-inch ball forces hitters to lock in on a smaller target, which sharpens visual focus, reaction time, barrel accuracy, and overall hand-eye coordination. If you can consistently square up a smaller ball, the game gets easier when you step back into the box against a regulation baseball or softball.

At ProLine, our 7.5-inch training ball is designed to challenge hitters in a way traditional training balls cannot. The reduced size creates less margin for error, helping players develop:

• Better barrel precision
  
• Faster pitch recognition
  
• Improved tracking and focus
  
• More consistent contact
  
• Increased confidence against high velocity
  

Because the ball is lightweight foam, players can safely get high-volume reps at game-like speeds without the wear and tear associated with standard baseballs. It’s one of the best tools for hitters looking to tighten their swing path, improve accuracy, and train with intent.

ProLine Balls work in any pitching machine: Spinball, Sports Attack, Jugs, ATEC, and more.

• Yes — ProLine Balls are softer and lighter than a regulation baseball, but they are specifically engineered to maintain true ball flight, durability, and high-velocity performance. Unlike soft or “squishy” training balls, ProLine Balls are built with a dense foam construction that allows players to train at game-like speeds with reduced impact on the hands, wrists, and body.
  
  This makes them ideal for:
  
  
• High-volume machine work
  
• Training at extreme velocities
  
• Reducing vibration and sting on mishits
  
• Lowering wear and tear on bats and equipment
  
• Helping players safely return from injury
  
  Because of their lightweight design, ProLine Balls also provide instant feedback — you cannot cheat the ball. Mishits are exaggerated, forcing players to develop cleaner barrel accuracy and more consistent contact.
  
  ProLine Balls are designed to give players safer, smarter, and more efficient reps without sacrificing realism or performance.

Yes — ProLine Balls are specifically designed to work with pitching machines and can effectively throw breaking pitches, including sliders, curveballs, cutters, and changeups, depending on the machine settings.

Our seam ball was engineered to introduce more realistic movement and variability, making it an excellent option for training against spin and off-speed pitches. Catchers and hitters can also better track rotation and pitch shape during training.

Our no-seam ball provides a more consistent and predictable flight path, which is ideal for high-velocity fastball training and precise location work.

Because ProLine Balls are lightweight and machine-tuned, they respond extremely well to wheel adjustments and spin settings across many major pitching machines, including:

• Hack Attack
• Jr. Hack Attack
• Iron Mike
• JUGS
• Spinball
• ATEC
• And more
  

Whether you’re training pitch recognition, timing, or handling elite velocity with movement, ProLine Balls are built to perform.

Yes — ProLine Balls are designed to perform in both indoor and outdoor environments, including wet weather conditions. Unlike traditional leather baseballs that can become waterlogged, slick, or damaged by moisture, ProLine’s foam construction maintains consistent performance and durability even in damp conditions.

Players and coaches use ProLine Balls in light rain, humid environments, and wet cages because the balls continue to provide:

• Consistent machine performance
• Reliable ball flight and accuracy
• Reduced wear compared to traditional baseballs
• Safe, high-volume reps without ruining baseballs
  

Our durable exterior is built to withstand demanding training environments, helping players continue getting quality reps without constantly replacing damaged balls.

For best long-term performance, we still recommend allowing the balls to dry after extended exposure to heavy moisture or rain.