No need to damage your floor with stickers or tape. The Viper Laser Dart Line accurately marks your throw line and disappears with a flick of the switch. Works for steel and soft tip boards. 

The laser is projected by the adjustable pointer, which can be positioned at any vertical angle for your desired level of distance. The laser line can be mounted on any side of the dartboard to best suit your game room. When the laser is set at the desired distance, you can tighten the two bolts on each side of the pointer to lock the beam into place. This prevents your throw line from moving when impact occurs.