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).
Includes: 18 flexible pushrod housings (tubes)
Inside diameter: 1/8
Outside diameter: 3/16
Note: Pushrods (solid wire or cable) up to 4-40 can be used with this housing.