FA.B. is made of birch plywood. Birch wood - a tree native to Europe - when harvested from sustainably managed forests poses lower environmental and biodiversity risks than those from tropical and subtropical trees. The fabric units are made of a recyclable, resilient, stain resistant, wrinkle - free fabric. The use of the durable fabric along with the minimum possible use of wood, allow us to consume as little natural resources and raw materials as feasible, according to the "dematerialization" approach that our times require. The castors allow you to move your fully loaded FA.B. around the room effortlessly - as opposed to the traditional bookcase. FA.B. is a foldable - literally! - and easy to assemble flat -pack furniture. Self - assembly helps to reduce volume and thus carbon dioxide's emissions, during transportation.