This is a Dedolight 10 Gel Filter CTO Set for DBD400 Barndoors. These pre-cut filters fit the DBD400 barndoors used on series 400 lampheads. They convert a daylight balanced light source, such as the D400, to various tungsten light balances.
The kit contains 2 each of:
Full CTO
3/4 CTO
1/2 CTO
1/4 CTO
1/8 CTO