Kohburg shelves feature the best qualities: Safety, Strength and Space! All shelf units have Kid Guard Rounded Corners and Edges to protect little ones and use 3/4" thick panels for added durability. Constructed from Australian Pine Fiberboard (APF), our 15" shelf depths provide extra storage space and additional stability to prevent tipping. Our exclusive Filosa Constructive System guarantees all shelf supports are made of non-toxic ABS and have pre-embossed numbers on each level to make shelf placement quick and easy! Each support structure is rounded to prevent shelves from sliding out. Almost all of our shelving units are mobile for easy room placement and classroom rearrangement.