Precast pieces of concrete, available in several formats, emphasizing the piece “gero” very used nowadays for its acoustic characteristics. The concrete blocks in "H" shape act as formwork in small retaining walls.

Elaborated in conformity with UNE EN 771-3:2004, they possess the marked European compulsory of safety (CE). The whole "standard" range belongs to the same resistant family, reaching resistances to compression of 5 N/mm2 advisable for conditions of non structural use.