This foam is for 1/2" PVC pipe,the diameter of center hole of the foam is 18mm,it will fit the diameter of pipe 20 mm,21mm.
Made of high density foam,it's much strong then normal foam and keep your tumbler or cup level,perfect item for tumbler glittering
This foam will grip your tumbler firmly, your tumbler will never drop or tilt
The big foam will for 30 oz tumbler and the small one will fit 10 oz tumbler 14 oz tumbler and 20 oz tumbler.
100% satisfy guarantee,please contact us if you have any issue with this item.