Apply this black Strobe Cover to your Sea & Sea YS-D1 or YS-D2 flash unit to safeguard the housing against scrapes and light bumps. When you're diving among rocks and coral, a little extra protection can't hurt. Additionally, the cover blocks any light from leaking out of the clear part of the housing. It fits snugly over the strobe like a glove, but leaves the front uncovered so you can continue to fire the flash. This convenient accessory has a fine mesh outer skin and a neoprene lining.