Spring Opening design opens with ease and when closed is secure,also work great for key rings MATERIAL: Zinc Alloy with rust-preventive coating. High strength and high resistant to corrosion. QUANTITY: 4 pieces SIZE: Picture two shows all the size, 4 sizes options, 3/4", 1" , 1 1/4" and 1 1/2" GUARANTEE: 3 month guarantee, For any reason you're not completely satisfied, Please contact us, if you have any problem with installation or product quality, we will be happy to solve your problem. 1 inch o ring gold o ring metal o ring bag of rings metal for ring making