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 up
Diameter: 56.8 mm / 2.2 in
Width: 42.4 mm / 1.7 in
Gap width: 4.6 mm / 0.2 in
Ball 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 in
Package weight: approx. 79.4 g / 2.8 oz
Package List:
1* Yo Yo Ball
1* String(color by random)
1* Instruction

Package List:

1* Yo Yo Ball
1* String(color by random)
1* Instruction