Check the listing for details. 10X Elecom Trackball Precision Ruby Bearing Balls AAA Grade. Condition: New. Listed at 13.20 USD. ALL ORDERS TOTALING $50.00 OR MORE QUALIFY FOR FREE SHIPPING 10 Pieces AAA Grade Bearing Balls for Elecom TrackballThese are 2.5mm Diameter Ruby BearingsFor: Elecom Trackball MouseEX-GXT2XT3Elecom DEFT ELECOM Deft ProElecom HUGE Main Photo Gallery shows the Bearings at Significant MagnificationBearings Will be Packed in a small glass vial to prevent damageElecom Trackball Replacement Ruby Bearings Authentic AAA Grade Laboratory Manufactured Ruby Not all Ruby Balls from other suppliers are AAA GradeGenuine AAA Grade Indicates Highly Polished and Precision DiameterHighly Polished for Smooth Operation and RotationCaution: Some sellers may also be selling Ruby Bearings, but they are actually made from Colored Quartz Glass These Ruby bearings have low friction and the same high precision as the Stock Elecom Bearings. Elecom Trackball Mouse IS NOT included With the required regular cleaning of your Trackball Mouse to maintain smooth operation, it is just a matter of time when you will lose one or more of your trackball bearings. They are held loosely captive and and often fall to the floor and be lost into oblivion. While one or more of these Ruby Bearings can be used in conjunction with the Stock Bearings, it is always best to replace all three to prevent any uneven wear and for the smoothest rotation.Designed to fit very precisely.All of the Bearings are Highest Grade and considered the smoothest of all bearings. For: Elecom Trackball MouseEX-GXT2XT3Elecom DEFT ELECOM Deft ProElecom HUGE