The Catrike Dual Idler Kit is for Catrikes that didn't come with a T-Cycle idler. The Elite kit comes with an Elite Power Idler, Elite Return Idler, and Clamp-On Single-Sided Chain Keeper. The Sport series comes with a Sport Power Idler, Return Idler, and a Stainless Single Chain Keeper. Both kits come with all the necessary hardware to make them work beautifully. This kit essentially replaces your stock Catrike parts with high-end T-Cycle idlers. Many times, you can completely eliminate the need for chaintubes with the Dual Idler Kit. Now comes with a Floating Chaintube Holder!