Shimano sp40 plastic outer gear casing capspreventing the ingress of corrosion causing water and dirt into your cables is vital to the longevity of your gear cabling the shimano sp40 plastic outer gear casing caps for 4mm cables not only help seal the cable but also ensure smoother more efficient gearshifts while doing so featuresmaterial plastic pair of sealed outer casing end caps for use with gear outer casing fits sis sp40 and sis sp41 cable housinga 2 year warranty is offered with all sh