They may also include microcoils to add pushback and contouring. Many hybrids place stronger gauge coils along the perimeter for strong edges and across the center of the mattress for targeted ...

wire diameter 1.0 - 1.3mm ( 18 gauge - 15 gauge ) - coil spring: wire diameter 0.5 - 0.7mm ( 24 gauge - 21 gauge ) The length of wire use depends on the circumference and the size of bracelets ...