uxcell Precision Chrome Steel Bearing Balls 40mm G10 2pcs bee wax sticks are not included Color:Black & Yellow 2 pack wax sticks are not included The highly sensitive tip provides great detail and accuracy and will enhance your experience with note taking some of the most common are listed below: 1 8" is often used for clusters and old Eglish style headsets 1 4" is often used for rear wheels and bottom brackets 3 16" is often used for front wheels 5 32" is often used for headsets with pressing cups Specification: Precision: G10 Diameter: 40mm Hardness: HRC58~62 Material: AISI 52100 chrome steel Package Includes: 2 Pack x Bearing Balls Smooth shape