Cold rolled high cabon steel..
Heat-treated Parts (Carbon Steel) #1
Heat-treated Parts (Carbon Steel) #2

     Steel strips are widely used for clock and watch industry, textile industry, instrument, toy, cutting tool, saw blade, automobile clutch vane, spring tape, leaf spring, tape measure, stationery clipper, hair clipper, shoe wick, washer, chain, etc. The photos showed above are parts of heat-treated products.