~ Gray Solid Silicone rubber boot coaster finisher for 20 oz/30oz & 40oz tumbler
~ Silicone boot perfectly fits the cup bottom and won't fall off 
~ Protection from depression, scratch, skid resistance and noise
~ Safe material made of food-grade silicone
~ Easy to use: just wipe the surface of the cup clean and dry, then pull the boot on and squeeze out the air.
~ Tumbler NOT included, boot only.