Concrete is an armchair designed by Jonas Bohlin in 1981 and now produced by Källemo. The frame of the chair is made of steel which can be untreated, painted black or coated. The chairs seat is made of solid ash and comes natural or painted. The name Concrete comes from the original chair that Jonas designed as part of his degree project for Konstfack, where he created 100 numbered chairs in cement. Today, Concrete is known worldwide and is considered a Swedish classic in furniture design.