CafePress Dihydrogen Monoxide Sticker Square Bumper Sticker Car Decal, 3"x3" (Small) or 5"x5" (Large) Express yourself with the design that fits your sense of humor, political views, or promotes your cause and beliefs. Our high quality bumper sticker is printed on durable 4mil vinyl with premium inks that resist the sun and elements, so your message will last for the long haul. These car decals are the perfect indulgence for your passion, or make great novelty prank gifts for him or her. Choose between Clear and White vinyl (where available). Size measures 3"x3" for Small, 5"x5" for Large. We offer 100% money back guarantee, so you can buy with confidence. Your satisfaction is our promise, and returns/exchanges are made easy.