The spring system is the most commonly used in mattresses. It incorporates rows of hour glass shaped springs which are joined to neighbouring springs by a continuous small diameter spiral unit called a helical. The perimeter is strengthened by a heavy gauge border rod or wire, top and bottom.
To alter the degree of firmness in an open coil unit, different gauges thickness and strength of and the number of spirals are used. A 12.5 or 13 gauge wire is hard,while 14 or 15 is soft. in general, there are at least 288 open coil springs in a 135cm 4'6" mattress and 325 in a 150cm 5' mattress.
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