These are SLIM 18mm (3/4) magnetic snap closures. These have a very strong magnetism. Easy to install, no special tools required. Installation
10set/Pack Strong Magnetic Snap Fasteners Clasps Buttons For
All Bag Making Supplies – Little Sewing Tree
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Everbilt Double Magnetic Touch Catch, Brown (1-Pack) 9236038 - The
O-Rings: (4 Pack) - Emmaline Bags Inc.