WARMUP & STRENGTH TRAINING: A versatile set of 4 weighted throwing balls. Perfect for players of all skill levels and abilities. A functional training tool, ideal for pre-game warm up or as part of a coach guided training program to improve throwing arm strength. BRIGHT NEON COLORS allow the player to easily identify each training ball weight. 4 CAREFULLY SELECTED WEIGHTS (6oz, 8oz, 10oz, 12oz) The 6oz ball is just 1 oz heavier than a standard baseball, perfect for beginners first steps in ball weight training. From there the weights increase in 2oz increments up to the heaviest 12oz ball. OFFICIAL SIZE AND AUTHENTIC MATERIAL The QuickPlay Weighted Baseballs are authentic 9in circumference official size baseballs. Featuring a durable leather cover, raised seams and a weighted core. Each set of 4 balls COMES WITH A MESH CARRY BAG for easy storage. NOT FOR BATTING / HITTING Please note the QuickPlay Weighted Pitching Baseballs are a throwing and pitching tool only.