Harpster Tarps Round Poly Tarps are 12 mil thick and weigh 6 oz per square yard with a 14x14 weave count. Made of polyethylene, they provide excellent UV resistance and are waterproof. Double grommets (spaced approximately 3 inches apart) are grouped approximately every 24 inches along the circumference of the tarp. Available in Silver/Black (Silver on one side and Black on the other) or Silver/White (Silver on one side and White on the other). The Silver/Black material provides 100% block out of sunlight, making it an excellent choice as a swimming pool cover or similar applications like spas or hot tubs. The Silver/White material is better suited for applications where it is going to cover grass areas. For example, Covering baseball or softball pitcher's mounds, the home plate area or individual bases. Other non-color specific uses could be to cover and protect firepits, round outdoor furniture, or anything else that a round cover will work best.**Tarps are Finished Size**