?QUICK CLEANING TIPS?- This mouse ball replacement part is simple to clean. Either use a soft brush or a lint-free fabric. Before replacement, we suggest that you can clean the inside ball hole to avoid possible erratic cursor movement. ?GLOSSY RED COLOR?- Its surface is painted with a scratch-resistant coating and glossy red color for more effortless optical identification and smooth movement. Works Temperature: -40? to 60?. ?HOW TO REMOVE THE BALL?- This SANWA trackball replacement can be easily removed from the mouse bottom using your finger or a pen. ?WORK WITH OPTICAL SENSORS?-This replacement trackball provides excellent optical sensors sensitivity. Comfortable for finger control and ensures a smooth & agile movement. Specialized in precise pointing, multi-screen work, file works, excel, data processing, and efficiency improvement. ?FIT IN 34MM TRACKBALL MOUSE?- This replacement ball is designed for any trackball mouse using a 34mm/1.34 inch trackball. Compatible with models like MX Ergo, M 570, M 575; SANWA GMATB128BK, GMAWTB129BK, GMABTTB130BK, GMATB167, GMAWTB168, GMABTTB169, GMATB155, GMATB44BKN/RN, GMABTTB1BK; ELECOM: EX-G Pro(M-XPT1MRXBK), DEFT(M-DT2DRBK-G), Kensington: Pro Fit Ergo(K75326WW), Perixx: Perimice-517, PERIPRO-801, Perimice-717, PERIMICE-520W, etc.