This velcro-like material, but really heavy duty. It's made of hard plastic and instead of being hook and loop, each side is the same (hundreds of little pillars with a ball on
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Jumbo Velcro® Brand Strap - Heavy Duty, 2" x 23', Black S-23595 - Uline
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VELCRO® Brand - VELCRO® Brand Heavy-Duty Stick On Tape 50mm x 5m White 5030610602443 | eBay