Speed Grid honeycomb cells narrow the beam of light from your portable flash unit, producing a small circle of light on your subject. Perfect for dramatic lighting effects. Fits any shoe-mount and most handle-mount portable strobes. Attaches quickly and easily to a Speed Strap (available separately). Usable honeycomb area is 3.5" x 2.25" (approx. 89mm x 58mm). Speed Grids are constructed of rugged ABS/polycarbonate. Patent pending design.