The coasters are made of lightweight plastic and are slip-proof, with a diameter of 4 inches each. Each set comes with a unique coaster holder in galaxy black filament that can hold all four coasters. Ideal for any occasions, be it Christmas, birthday, Halloween, or housewarming, These coasters are sure to impress your guests. You can choose which set (Pikachu, Charmander, Squirtle or Bulbasaur) you would like from the photos provided. The best part? Buy more sets and get more discounts!