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Lock in your grip. Level up your game.
The 4APP Square Rosin Bag is made for pitchers who want that solid grip without overthinking it. Whether you’re getting your work in on a bullpen day, chasing velocity, or just need something that actually works, this bag’s got you. Built to be simple, durable, and effective - nothing fancy, just what you need.
Key Features:
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10oz square-style rosin bag
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Dark rosin blend from South Georgia pine
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Absorbs sweat fast and keeps your hand dry
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Heavy-duty polyester shell built to last
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Same stuff we use in our own training
From high school fields to pro bullpens, this bag shows up every day.
Please allow 1 to 3 business days for order processing before shipping.
The 4APP Plyo Ball System is a 7-piece velocity training set engineered for elite pitchers and competitive arm development. Featuring a gapless overload-to-underload weight spectrum, a humidity-resistant engineered shell, and a revolutionary half-seam dual-feel design, this system provides unmatched biomechanical grip and authentic pitch feel across all training environments.
- Humidity-Resistant Grip: Features a proprietary composite shell texture that maintains a clean, consistent hold in sweat and high heat, eliminating dangerous over-gripping.
- Dual Feel Half-Seam Architecture: Engineered with one side featuring realistic raised seams for pitch shapes, and a completely smooth side for constraint-based mechanical training.
- Cohesive Weight Spectrum: A complete 7-piece progression covering 3.5 oz up to 4 lbs, completely eliminating weight gaps for smooth biomechanical scaling.
- Optimized Rebound Control: Dialed-in wall thickness guarantees durable, controlled rebound profiles off hard facility surfaces to prevent unpredictable ricochets.
Stop guessing. Start tracking.
The TAG One Sports Radar is the official radar used by 4APP to measure real performance. Whether you’re throwing bullpens, hitting in the cage, or training on your own, this gives you instant, accurate velocity and exit velo so you actually know what’s working.
If you’re serious about improving, this is where it starts.
KEY FEATURES
- +/- 1 MPH accuracy for reliable velocity and exit velo tracking
- Tracks both pitch velocity and exit velocity in real time
- Directional filtering so you only capture the reps that matter
- Bluetooth connectivity with iOS and Android app for session tracking
- Stores session history and player data so you can monitor progress over time
- 130-foot range for flexible setup in bullpens, cages, or on-field
- Ultra-compact design (57% smaller than most radars) so you can train anywhere
- Internal lithium-ion battery with up to 6 hours of continuous use
- Multi-sport functionality (Baseball, Softball, Golf)
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The game rewards skill, discipline, and competitive fire. We exist for players who want more than participation.
