This set coordinates with Reveal Whee! and Car Critters to make a fun, interactive card with passengers inside a car! To make it even easier, use the optional Reveal Wheel Templates: Car Critters Add-On for quick stamp placement! Check out the Reveal Wheel collection for endless possibilities! approximate sizes: window opening: 1 1/8"" x 1/2"" Lawn Cuts custom craft dies are high-quality steel, made in the USA, and are compatible with most die cutting machines!