This amber Profoto OCF II Quarter CTO Gel Filter is designed to be used with the B10, B10 Plus, and B1X. It attaches magnetically to the OCF II Grid and Gel Holder or the OCF II Barndoor. This filter, which stacks easily with optional grids for selective lighting and warms the color of the light from approximately 5500K to approximately 4500K, is frequently used for cosmetic purposes.