Specialized Ribbed Solid Rubber Plug for ICR Entry/Exit Port Description: The Specialized Ribbed Solid Rubber Plug for ICR Entry/Exit Port works to fill ports left unused when altering drivetrain configurations onboard select Specialized Crux and Levo 4 models. Features: Genuine Specialized replacement parts Internal Cable Routing port plug for select Specialized Crux and Levo models Fits ports that are 6-7mm in diameter Specifications: Material: Rubber