This machine has 25 neddles and they are mainly used for sewing docorating edge of the mattress. It has complicated material transforming devices to choose. It can sew different styles of edge tapes by using different material transforming devices such as zippers, decorating tapes, ventilated tapes, logo tapes etc. This machine is highly automatic and can stop working automatically when there is no cloth. There are a variety of optional boot devices which are easy to replace.