for SRAM RED 11-speed 11/32 cassettethe original 32T cog can be replaced with a cog with same number of teeth, an ARI 32T cog, or with an upgrade ARI 34T or 36T, without any additional modification on your bikereplacement is easy and fast material used is ERGAL 7075T6 hard anodizedthe range of colors is available in the color chartweight of 32 teeth cog is 42 gramsweight of 34 teeth cog is 46 gramsweight of 36 teeth cog is 50 gramsweight of the original SRAM 32teeth cog is 45 grams