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Please always use the foam a little bigger then your tumbler ,not a smaller one, then push the foam to your pvc pipe first, and push the foam into your tumbler/ cup/ bottle, if necessary , move the tumbler to make it level. This Foams set is made of high density foam ,with special honeycomb design, it’s very snug and hold your tumblers/cups evenly, keep your cups level and your works will never drop. 4 pcs of foams with 4 sizes, together they will fit your tumblers/cups/water bottle with mouth open from 2” to 4” ,almost includes all tumblers you glitter normally. MasBros latest designs, your best choices. This set will work with 3/4” PVC pipe, please select another size if your PVC pipe is not 3/4”.A 3/4" PVC pipe will have 1-1/16" outer diameter,3/4" is not its diameter. Item includes 4 pcs of foam, in different sizes.