NEW MOLD*: OD = 20.5" x 9, ID = 14.25" x 4.25"

This will be the sturdiest mold you have ever owned! Short of dropping them on the ground we don’t see these molds disappointing you. Made of a super flat and smooth mullite/cordierite composite material. Listed dimensions are exact…No waiting till you get the mold to make glass to fit it! We have not seen these molds crack, warp or crumble in any way during regular use in our studio.

Slumping molds/dropout rings should be coated with some sort of separator to prevent the glass from sticking to the mold. Standard shelf primer works fine but we’ve learned it can be a bit too slippery from time to time. OnGrade Studio recommends coating dropout rings with DOP: dropout paste

*shown here on a 24" diameter lap wheel for scale