Featured Books & GiftsCave & Caving BooksUpdated Sale PageGift CertificatesSale Priced GoodsBat BooksJewelryRare Books & CollectiblesClothing & AccessoriesToys & PlushHome, Art & Gifts Home > Featured Books & Gifts > Home, Art & GiftsClick Image To View Larger 8.4 Ounce Bat TumblerThese cups are made of corn starch mixed with melamine resin. 70% of the material is natural fibers and makes it a more sustainable option than plastic products, since the majority of the ingredients comes from renewable sources. Price: $4.50 Price: $4.50