A combination of silicone and pumice make this a flexible wheel, excellent for removing scratches around bezel and prong set stones. Safe for most stones and are long lasting. 5/8" diameter knife-edge.
Max. operating speed: 20,000 rpm.
Sold in packages of 10 and 100.
Please note: GK-9 pumice wheels are no longer manufactured. Silipum is very similar and is a popular alternative to GK-9.