Bearing specifications: 12.70x6.30x4.762mm, ten beads gold-plated KK. Please check the size to see if it is suitable for your yo-yo's bearing specification before purchasing. KK bearing, all gold-plated. The precision is higher than ordinary KK bearings, and no lubricant or other auxiliary products are needed to achieve optimal performance. The biggest advantage of this special bearing is that the string stays centered within the bearing during play, which reduces friction between the string and the inner wall of the yo-yo. Improves spin time, reduces energy loss, and provides a smoother, more comfortable playing experience. [Installation method] 1. Unscrew the yo-yo, insert the bearing through the center, then reassemble the other half of the yo-yo. Note: Do not over-tighten. 2. Apply a small amount of yo-yo grease or maintenance oil to the shaft and bearing if desired. 3. Avoid applying too much lubricant, as it may transfer to the string and affect performance. Color: Gold Material: Steel Size: 12.70x6.30x4.762mm Package Contents: 8 x Gold-plated bearings Only the above package content is included; other items are not part of this package. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement tolerance is +/- 1-3cm.