Lightweight and well made [Elastic rope material] Latex silk core, outer thread is polyester or polypropylene thread. [Uses] Can be used for crafts, gifts, toys, accessories, clothing, footwear, luggage handbags; The plug is made of durable plastic material and strong springs, so it is highly resistant to breakage. The shape is smooth and has little burrs.Hole Diameter: Approx. 0.2 inches (6 mm). The rubber just 0.2 inches (6 mm) is difficult to insert a little rubber, so it is recommended that you use a size of 0.2