The Nanlite Fabric Barndoors and Grid for PavoTube II 15X LED Pixel Tubes mounts via T12 diameter clips to minimize light spill and add directionality. Control Light Spill Equip your PavoTube II 15X LED Pixel Tube with the adjustable fabric bar doors and modify it’s beam angle from 180° down to less than 5° Add Directionality Add the included 45° Fabric Grid to selectively light subjects without losing the PavoTube II’s diffuse light quality. Standard T12 Diameter Mount While created for use with Nanlite PavoTube II 15Xs, the PavoTube II Fabric Barndoors and Grid is compatible with other T12 tube lights approx 2ft in length. Light Weight Construction Made from ripstop nylon, PavoTube II Fabric Barndoors and Grids fold flat and travel light.