4 x 100 7mil Mylar on White (311100) What would be ''lost'' light, now is utilized for maximum efficiency. 7mil thick mylar with white PE film backing for added strength. This product will not tear easily like other mylars. Attach to any surface for ultimate light uniformity. Get creative: mount to walls, poles, pots. Highly reflective. Use either side. Double the thickness of any other type on the market. Case quantity is 1 roll. - 98% reflective - Optimum light return for your plants - Excellent light blocking capabilities - One side white, the other side reflective material - Reduces "hotspots" by spreading your light evenly - Tear Resistant Manufacturer's Product Information MSRP $ 174.95 Dimensions 5 x 5 x 49