We're pretty sure that you've never seen bar accessories that are quite as irreverent as these Rx Prescription Drink Coasters. Each coaster in this set of four is made from spongy silicone that will protect your delicate wood. They are humorously decorated as a fake prescription pad and can even be written on with a standard pen (and then washed off later with a soapy, wet rag). Doctor, doctor, give me the news: These Rx Prescription Drink Coasters have a bad case of being perfect for your brews. Get your set today! In stock and ready to ship. Features: Made of silicone. Coasters can be written on with a pen and washed off later. Specs: Coaster Dimensions: 4"W x 4"D. Includes: (4) Coasters.