Racquet Club Personalized Tennis Coaster Set. The tennis enthusiast or home bartender will appreciate these sets of four richly detailed, waterproof coasters, which reflect his fave activity. Our personalized coasters are a perfect accessory to any bar or family room. Our Racquet Club Personalized Beverage Coaster Set's personalized design is printed in full color onto a non-skid cork base. Includes 4 coasters and mahogany caddy for storage. Each coaster measures 3.75" x 3.75".