These new rings are an improved version of the Performance Rings. They will fit any Custom yoyo that was molded for Performance rings. With each order you will receive 5 pairs of performance rings, which is a total of 10 rings. For installation simply remove center tab from ring, and replace old performance ring with the new Custom Yoyo Performance Ring.
If you are buying a yoyo, don't forget to buy a yo-yo trick book to carry with you, a yoyo trick DVD for at home, and extra yoyo strings. Learning new tricks makes yoyoing much more fun, and you'll need extra strings, because they wear out with regular use.