Feature:1. Made of premium aluminum alloy material,anti-deformation,anti-collision and durable to use.2. Designed to train fine motor skills and eye-hand coordination.3. It also can cultivate the imagination,creativity and rapid reactionability.4. 10-ball bearing provides 4.6mm gap width,fits for playing tricks.5. Come with a string,easy to use.6. Suitable for professionals,beginners and 8 years+ kids.Specification:Perfect choice for professionals,advanced players,beginners,kids,etc.Features:Made of premium aluminum alloy material,anti-deformation,anti-collision and durable to use.Designed to train fine motor skills and eye-hand coordination.It also can cultivate the imagination,creativity and rapid reactionability.10-ball bearing provides 4.6mm gap width,fits for playing tricks.Come with a string,easy to use.Suitable for professionals,beginners and 8 years+ kids.Specification:Color: 1 / 2 / 3 / 4 (optional)Material: 6061 Aluminum alloy For age: 8 years upDiameter: 56.8 mm / 2.2 inWidth: 42.4 mm / 1.7 inGap width: 4.6 mm / 0.2 inBall weight: approx. 65.1 g / 2.3 oz (not includes strings and other accessories)String length: approx. 1050 mm / 41.3 in (for each)Package size: 103 * 60 * 47 mm / 4.1 * 2.4 * 1.9 inPackage weight: approx. 79.4 g / 2.8 ozPackage List:1* Yo Yo Ball1* String(color by random)1* InstructionPackage List:1* Yo Yo Ball1* String(color by random)1* Instruction