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Spring boxes «Bonnell»

     Spring boxes «Bonnell» - is the hardest, classic spring box out of interconnected biconical springs. It is the best mattress core for those who chose traditional technologies. The boxes springiness level depends on the density variations of the springs, their height, number of coils and the wire thickness. The box structure stability provides optimum level of weight distribution, and, therefore, furthers muscles relaxation and calm repose.