Professional materials: Natural rubber latex thread imported from Southeast Asia with excellent elasticity and resilience, ensures constant tension and can be stretched up to 2 times. Sturdy and Durable: The highly elastic rubber core ensures that it will not tear or break so easily. The high-strength polypropylene wire sleeve guarantees resistance to abrasion, UV and bad weather. User-friendly: Elastic tensioner secured in a few seconds, very easy to use. Pull the elastic through the two eyelets for fixation and pull the loop over the ball. Package delivery: 50 elastic cords with balls. The diameter of the tent rubber is 4mm and the diameter of the ball is 22mm, the total length is 10cm and can be stretched to 20cm. Multi-application: The length of 10 cm is sufficient for daily binding needs and reusable. Definitely a good helper for securing tarpaulins, tents, posters, banners, flags, trampolines, etc. Compare with similar items 4mm natural rubber premium quality with excellent toughness, elasticity and elasticity that stretches up to 2 times. Sturdy and durable. High strength polypropylene jacket ensures resistance to abrasion, UV and bad weather. Anti-aging and long life. Spherical head in polypropylene. The 2 cm diameter ball ensures constant tension and firm hold. The rubber straps attach in seconds, very easy to use. Highly elastic rubber core. 10cm in length in natural state, can be easily stretched up to 'at 20 cm. Not easy to tear or break.