is made of 12mm waterproof birch/pine plywood. This type of material is a perfect compromise betweenstrength and weight.
All the facets are glued together with waterproof adhesive, additionally reinforced with 35mm stainless steel screws. The top layer is sanded and oiled, thus providing extra protection coating against moisture.
The box is standard size 2" x 20" x 12" (5 cm x 50 cm x 30 cm) and is compatible with other solutions of this type available on the market.