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 Dual functions for professionals,beginners and 8 years+ kids. Gold 10-ball bearing provides 4.4mm gap width,fits for unresponsive use.Suitable for professionals and advanced players playing tricks. Silver 8-ball bearing provides 3mm gap width,fits for responsive use.Suitable for beginners and 8 years+ kids. 3-finger glove help to get minimal friction for high speed string tricks.One size fits most hand size. Come with 5pcs strings,easy to replace and use. Specification: Color: Brown / Black / Red (optional) Material: Aluminum alloy For age: 8 years up Diameter: 55 mm / 2.2 in Width: 41 mm / 1.6 in Gap width: 4.4mm / 3mm Ball weight: approx. 66.7 g / 2.4 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. 97.6 g / 3.4 oz Package List: 1* Yo Yo Ball 1* 8-ball Bearing 1* Screw (for silver 8-ball bearing) 5* Strings(color by random) 1* Instruction 1* 3-finger Glove