These Oklahoma State Cowboys Tumblers - Set of 2 (20 oz) are all-purpose tumblers that have the look and feel of glass but are made of shatter-proof acrylic. Designed for everyday use around home and office and make fabulous gifts for fans of all ages! Set of two. are all-purpose tumblers that have the look and feel of glass but are made of shatter-proof acrylic. Designed for everyday use around home and office and make fabulous gifts for fans of all ages! Set of two.