The Shopping Trolley Frame is a double-sided sign holder that can be attached to the front of a shopping cart or the back of the child seat. It is used for selling advertising space on both sides as a profit center or to advertise in-house special promotions and sales. It is easy to attach to the cart. Just snap the two sides of the frame together and secure with the included zip ties. The frames hold 7" x 11" signs on both sides. Simply insert your signs into the slots in the frames. Made from shatter resistant plastic. Sold in packs of 10.