Quality materials:Made from nylon plastic and alloy, these zip heads are rust-free, corrosion-resistant, high-strength, colourfast and have a delicate and comfortable feel, making them ideal for making clothes, bags and more. Easy to use:When replacing a zip slider, simply remove the old slider and use this new zip slider repair to fix it in seconds, without complicated operations, saving time and effort and making it less likely to come off. Various sizes of zips:Contains various sizes of zip heads, with 3 different sizes of black zip heads, 2 of each size, you are sure to find the perfect match for your repair, very handy. Wide application:With a wide range of applications for clothes, bags, jackets, jeans, backpacks, tents, suitcases, boots and other DIY projects, these zip-heads save you a lot of money with enough backup for future use. Suitable models and colors for zippers3 # thickened black one 5 # thickened black one 8 # thickened black one (2 pieces each)