This Bowens Soft Strip Softbox measures 55 x 16" (140 x 40 cm) and is designed for use on flash heads only. It has a silver interior for crisp highlights. It features a removable inner baffle and front diffuser. Mounting this softbox to a Bowens flash head is easy and smooth. Its included adapter ring has a unique design that tilts out as the box is assembled. When the fourth wand is inserted into the adapter ring, the whole adapter swings into the assembly and locks into place -- no more struggling with a difficult fourth wand.