Brazilian designers Fernando and Humberto Campana have chosen a coconut fibre rug commonly used for doormats as the latest material to incorporate into a furniture collection.

The Campana brothers added the material, known as capacho, to the surfaces of storage pieces made from Brazilian walnut laminated wood.

"The Campana brothers continue their inherent exploration of the infinite possibilities of conventional materials, giving them back a certain degree of preciousness and employing them as prime and premium elements in unexpected treatments and finishes," said a statement from Estudio Campana, which recently used other bristly materials to create an indoor forest.

The duo's Capacho Collection was created for São Paulo design gallery Firma Casa. It includes a cabinet, a nightstand, a buffet and a chest of drawers.

Two doors fronting the large cabinet conceal three levels of shelves, contained within a wooden shell that sits on four short legs.

The handles comprise chunks of brown marble – a new material for the studio – while the surfaces are covered in the capacho, first used by the duo as part of the scenography for their 2012 Barroco Rococo exhibition at Paris' Musée des Arts Décoratifs.

The coarse material, also known as coir, is cut into geometric patterns and applied across the chest of drawers.

A row of six offset cube-shaped compartments form a long, low sideboard known as a buffet, raised up by angled legs at each end.

All of the square faces are covered in the bristly material, including the fronts of the drawers.

Created from an amalgamation of four different-shaped volumes, the bedside table's cupboards and drawers are stacked to form a blocky number five.

The surfaces, including those surrounding the voids, are again lined with the fibrous material and framed by the wood.

"The Capacho Buffet and the Capacho Nightstand bring an original geometric shape that results in unexpected and functional pieces of furniture," the designers said.

The collection is on show at Firma Casa's showroom at Alameda Gabriel Monteiro da Silva 1522, in the Pinheiros district of São Paulo.