Bonell spring form are manufacturing from phosphate wire different dimension: diameter of wire: from 1,9 mm to 2.4 mm diameters, diameter of interlock wire: from 1,3 to 1.35 mm, high of Bonell form : from 70 to 145 mm, diameter of spring: 65 mm do 91 mm. length and width tolerance of Bonell form : +/- 10 mm. Manufacturing of Bonell springs is made on high quality machines FIDELS and SPUHL to fold springs. On customer wish, every Bonell form can be end with steel frame or frames and veneer with polyurethane foam. Price calculation for is made individually, after giving by customer format You are interesting in (type of felt, depth and type of foam PU etc.). On Your wish we can pack Bonell form using Roll-Pack system (folding).