The interior is specially designed with raised and a strainer that prevents the liquid in the cup from leaking onto the furniture,no more worrying about spills and stains on your table or home bar,made of high quality materials that are heat and wear . protect table tops from and scratches,fit most cups and can also accommodate large beer mugs,coke cups and more. The flexibility and durability of silicone ensures they can be used for cold or hot drinks in any indoor or outdoor setting. The coasters can be used on table tops made of any material,such as wood,glass,bamboo,soapstone,marble,stone tables and more. They can completely protect your kitchen countertops,table tops,desks,barstools,or other of furniture surfaces from leaving unsightly marks or terrible scratches. just clean with water or dry with a paper towel.