They are made of injected plastic elements, such as polyacetal resin and are light weight and swimwear suitable.
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I have used these before and they are perfect for full swim suits for our grad children. This one will be for the smaller one and as yet have not used it as it is the middle of winter. I will be using it later in the year and I know how much the young man has grown. These are brilliant zips and only buy them from Boo.