*WS20 ECO racks are made of partially oriented timber from the Northern regions of Russia. according to the technology, several lengths are allowed. The splice of the bar is a mini spike 16mm long. *The plywood is made of birch water-resistant FC (general plywood) (Urea formaldehyde glue) or FSF plywood (nol-Formaldehyde Resin) 24 mm thick, spliced to a mini spike 16mm. Plywood is your choice. * Glue "KESTOKOL PUR 10" FINLAND (Polyurethane adhesive for the woodworking industry "JSC KIILTO"). * Yellow Rigonn impregnation-coating. Stability is 3-5 years (based on Tikkurila Finland components). * Protection of the beam ends with special elastic plugs