Our Christian Car flags are made of durable, knitted polyester and are double sided for longer life. The staff and window clip are made of nylon. After trying a large number of different suppliers, we finally found one that was suitable for highway use. However if you drive at speeds over 50 mph frequently the life of these flags may be 1 month or less. But that is pretty good considering the extreme conditions. These Christian flags are equal or better quality to car flags sold by other web sites for up to 20 each. We purchase in bulk directly from the manufacturer and pass the savings on to our customers. Dimensions: Flag-15"x12", Staff-20"L, Clip-3"W.