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Injin karfi winding, a cikin wani spiral, akwai uku daban-daban sassa: 3.2mm "R", 4.2mm "M", 6.5mm "T".
R rabo, rabo karami da kuma babban zafi yanki, tare da babban zafi yaduwa;
M rabo, rabo ne mafi girma, zafi da iska juriya ne karami;
T rabo, dace da yanayin da tururi matsin lamba mafi girma da kuma iska zafin jiki tashi low.