Mondi Black & White Heavy Duty Propagation Tray, No Holes 1-50 Pack BRAND NEW (1) Premium grade virgin materials for cleanliness and durability Premium white plastic for increased light reflectivity Reinforced outside shell made from recycled materials provide strongest support to date Black base prevents light penetration to the root zone and reduces the chance of root disease Best design 1020 flat (standard propagation tray) on the market