After thorough testing, Tekno is proud to release the EB410 Composite Differential Gear Set. This differential gear set reduces rotating mass as well as the overall weight of the EB410 by 8.5 grams per set. That’s over 25 grams of rotating mass reduction overall! Dollar for dollar, this is the single best upgrade to save weight and improve the acceleration of your EB410. Each package will upgrade a single diff, and three packages will completely outfit the EB410. This is a direct replacement for the original steel differential gear set (TKR6550) and does not require any additional parts.