They're plastic funnels,
Verified Purchase(What is this?)
This review is from: Draper 43853 4-Piece Funnel Set (Automotive)
What more can I say?! Cheap plastic funnels. Bit on the very small side and more at home in a childs play set than a garage. Also imagine they'll snap easily under a bit of pressure but they shouldn't really be subjected to any. I've got them, they funnel liquid and I'll no doubt use them at some point. Would I buy them again?! Probably not.