Adopts double idler wheels and needle feed materials at the same time, stronglope climbing force, small change of needle. It can sew sponge, thin leatherd needle bearing with fine needle bearing with fine lubrication, little attrition, low noise and long life, thin leather with even, smooth and inflexibility. It adopts ball and needle fine lubrication, little attrition, little attrition, low noise and longSuitable for sewing riding boot, gym shoes, leisure, sponge shoes, baby's shoes, high grade leather shoes and all kings of cases.