Review on 🥤 Premium 12-Piece Tumbler Turner Foam Kit – Elastic Sponge Inserts for Tumbler Cups, Ideal for 10 to 40 Ounce Tumblers, PVC Compatibility by Angela Rodriguez

I buy everything under the sun fit mine 20 and 30 oz Straight Skinny. In addition to making my own holders by adding paper towels or a rubber pad to small pool noodles as large pool noodles will not fit. It was a hot mess. Black foam rubber doesn't fit either. The ones that look like flowers will give you two for $16-20 and the rest is worth nothing. I was so happy when I received them. The foam is pliable but the cups hold evenly. The large ones are perfect for 30 oz. and the smaller ones are suitable for 20 ounce straight skinny. The trick is to lay the cup flat on the workbench with the 3/4" PVC pipe and foam already on it, then press it right down to the center in a plunging motion. Never fail.