The Quick Back™ label holders are made of molded plastic. These clips are 2 1/2 x 1 1/4 (D) and fit .187 (D) wires. The Quick Back™ label holders can be used on any comparable right angle scanhook from other systems. These attachments have a thin profile which allows them to flex open easily while still firmly holding plain paper signs in place. The Quick Back™ label holders come in bags of 25 and qualify for quantity pricing when 8 bags are purchased at one time.