The GRT4 Green Magnetic Reflective Target for Pacific Laser Systems Lasers is a durable reflective target for the PLS 3G, 5G, 6G, 180G, and HV2G green beam lasers. This green target is used to enhance the visibility of construction lasers when performing interior projects. It also features a magnetic part that allows the target to easily attach to steel supports and beams. Plus, it consists of a compact size of 4.5" L x 2.9" W x 0.5" H.