This is a package of 30" plastic pushrod tubes. They are designed to be use with solid wire or cable-type pushrods and help prevent binding (many pushrods come with an outer tube like these). PACKAGE INCLUDES: 18 flexible pushrod housings (tubes) COMMENTS: Pushrods (solid wire or cable) up to 4-40 can be used with this housing. SPECS: Length: 30" Inside diameter: 1/8" Outside diameter: 3/16"