Secret Jardin Dark Propagator v4.0Secret Jardins Dark Room Propagators are made of 95% reflective mylar with a hammered effect which increases light intensity and improve light distribution. They are water proof and include cable and air extraction ports. The SJDP120 model includes 2 metal shelves allowing for four 10x20 propagation trays per level, for a total of 12 total trays! Each one is virtually light proof and features very sturdy construction and hanging bars for T5 lighting