2pcs Professional Yoyoball Aluminum Alloy Responsive Yoyoball with Unresponsive Bearing for Professionals Beginners Perfect choice for professionals,advanced players,beginners,kids,etc. Features: Made of premium aluminum alloy material,anti-deformation,anti-collision and durable e. 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 12pcs strings,easy to replace and use. Specification: Color: Brown and Black & Red/ Black and Burgundy / Black & Blue and Black & Pink (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: 66.7g / 2.4 oz (for each) String length: approx. 1050 mm / 41.3 in (for each) Package List: 2 * yoyo balls 12 * strings (random color) 1 * storage case 2 * bearings 1 * bearing puller 2 * axle 1 * Allen key 2 * gloves