The MT sensing edge product line consists of three standard models: MT21 (2 in W x 1 in H), MT22 (2 in W x 2 in H), and MT33 (3 in W x 3 in H). When touched lightly, the sensing edge will send an immediate signal to operator controls to stop and/or reverse door operation. The MT edge switch is covered in a durable vinyl jacket. The top tab inserts between the double-L angle bottoms bars on a rolling door. These sensing edges are flexible and can conform to irregularities in the floor.