The polypropylene (PP) strap has undoubted characteristics of economy and practicality in use. It is therefore the ideal packaging material for the most varied sectors of the industry and the craft industry. The product can reach high levels of anchorage, so as to always guarantee maximum reliability and tightness. Thanks to its elastic retraction it always exerts a constant force. It can be used both on automatic and semi-automatic machines and is also for manual use using strainers with vibration welding or with metal seal.