TISO Aluminum LOCK RING Green for CAMPAGNOLO Cassette 11 Teeth. Designed for 11 speed Campagnolo Cassette. You must select lockring based on the smallest cog on the cassette - either 11 tooth or 12 tooth cog. It will either be stated on the cog as 11t or 12t or you need to count the number of teeth on the cog to determine which lockring you need. TISO lockring weighs 5 grams. Color options listed in shopping cart.