Hydrofarm MY1M50 50-Foot by 4-1/2-Foot 1 Ml Reflective Metalized Film Reflective Film can give your plants an extra boost of light without using any more electricity Film is extremely reflective material and is especially useful in those dark corners Hang it on the wall with thumb tacks or tape and there will be a visible difference in the brightness of your grow room Roll contains 50' x 4 1/2'