BONNEL SPRINGS This is the traditional system of biconical springs fastened together by means of spiral steel wire with a gauge of 1.30 mm. This is undeniably the most common spring system in the world. According to the number of springs (between 93 springs/sq m and 136 springs/sq m) and to the gauge of the wire used for making the single springs (2.00 - 2.20 - 2.40 mm), different structural rigidity can be achieved. The height of the springs varies from min. 7 cm to max. 14 cm.

H.D. SPRINGS This system is based on the BONNEL system. The head of the springs is very small, so as to achieve a number of springs per square metre of around 212 (High Density). Such a high number of springs makes it possible to make a real orthopaedic mattress which must be rigid but not too hard. The spring is made from a 2.00 gauge steel wire. The spiral is made from a 1.3 mm steel wire.

BOXED SPRINGS In terms of quality, this is undoubtedly the best system. The main features are: the large number of springs in the mattress (390 in the single) and their independent movement for utmost overall flexibility; the quality of the phosphatised patent steel and the 100 g /sq m polypropylene fabric used for boxing. The option also exists of having the same type of springing system but with "differentiated areas", using a 1.8/2.0 mm steel wire. Ideal for bases with movement.

BOXER This product was developed to answer the need for springs with reinforced sides and a very compact and sturdy structure. The finished mattress also has a fine appearance. How is "boxing" done? A casting of cold foam in special moulds thermosets and bonds the various components of the boxer permanently together (springs, felt and polyurethane), contrary to what normally occurs by gluing the side bands. The boxer springs can be replaced depending on the quality the Customer wants, starting with the traditional Bonnel, to H.D. springs, right up to the very best with boxed springs.