The fastener combines two sides:Hook side and Loop side.Applied with button,zipper,binder and so on. Polyamide+Polyester Hook&Loop Fastener TapesWidth:13mm,16mm,20mm,25mm,30mm,38mm,50mm,100mm,110mm,130mmIt is ideal for use in the following applications:outdoor gear,medical,clothing,footwear,packing,ect. Nylon Hook&Loop fastener velcro tape