This is an option Low Friction Pullet Set. The is a complete pulley set that is made from a special low friction natural color material to increase drive train efficiency. This pulley set fits both the MRX6R and MRX6. Items included: -H0251B-C x 1pc - H0251C-C x 2pcs -H0251K-C x 1pc -H0251L-C x 1pc -H2201C-C x 1pc -H2201D-C x 1pc -H2202-C x 1pc
