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Black EPDM synthetic rubber spacers are very tough and rigid and will not tear. It allows less flex between holster/sheath and belt clip, but has memory. -
Black Silicon rubber spacers has more spring-like properties and allows more flex between holster/sheath and belt clip and has no memory. It can tear when cut but it's not likely because of the thickness and density.
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Commonly known as 8-8 Eyelets used to bind two pieces of 2mm (0.080) layers of Kydex
