This is the Litepanels 4-Way Barndoors for 1×1 LED Lights. The barndoors are compatible out of the box with all LED 1×1 models except the Astra which requires B&H# LIASTRA1X1 for use. This lightweight metal light shaper slides into the same accessory rail system which is used by Litepanels filters. The barndoors are ideal for controlling spill light or flagging off portions of the beam.