Very thin plastic, comparable to a plastic milk carton. Not as big as I thought they would be. It will probably work, but not sure about screwing the stem onto the funnel, it might leak, haven't tried it yet. But a bit disappointed with the quality. I'm sure this thing will work, but don't expect it to last too long.
π° Efficient Filling Funnel for EPAuto Radiator Coolant System
9 Review
Lisle 19802 Threaded Oil/Transmission Funnel: Hassle-Free Pouring and Precision Funneling
9 Review
π§ Lisle 19612 Multi-Application Oil Funnel (19912): Simplify Oil Changes with Ease!
9 Review
Funnel King 94100 100-Ml General Purpose Graduated Measuring Container
13 Review