A replacement Friction Reduction ring to the MMJGRIND. we strongly recommend replacing the ring upon wear. On proper use, and not more than 1 gram a day, the ring is expected to last 1 year and covered by a warranty. However, in case of heavy use, an accelerated wear may require to replace the ring with a new one.
MMJC7PP, MMJC7AA, MMJ7CAW, MMJDS7AW