It the category of waterproof neodymium sew in (sewing) magnets, Ø18x2.5mm is a best selling sizes for most distributors. It is used in binders, folders and other printed materials, and works as magnetic clasps. PVC coats make it waterproof. Standard neodymium waterproof sew in(sewing) magnets 18x2.5mm are delivered in matched pairs of “+” and “-”, and with zinc coated.
Mono-pole: With steel housed covered, only one magnetic pole normally work.
PVC sealed: Ø18x2.5mm steel covered disc magnets are coated with PVC waterproof material.
Used in pairs: Waterproof sewing magnets 18mm are usually used in pairs of “N” and “S” when work as magnetic buttons.
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