These are tapered rubber plugs are great to seal the bottom of aluminum molds. Just fasten wick to the top of the mold, pull tight at base and push small end of rubber plug into hole at base of your mold.
This all new liquid mold cleaner works great on all metal molds. Helps clean the build up of dye and fragrance on the molds. Can also be used to clean all pouring pots. Not a better price out there on this product!