Hi friend, This is Mia from Weihai Huaxing Nets, a professional nets manufacturer with 30 years' experience. The cat netting is made of knotted HDPE with 19 mm mesh. And it is pre-stretched – will not sag or stretch over time. Please feel free to contact us if you are interested in this product. Best regards Mia Company name: WEIHAI HUAXING NETS CO., LTD Company address: Room 634 | 166 Wenhua West Road | Gao District | Weihai | Shandong | China Company website: www.huaxingnets.com <http://www.huaxingnets.com > Tel:+86-631-5665655