Velcro
https://theclassroomstore.com/categories/Office_Supplies_Materials/Mounts/Velcro
Products
Velcro® Fastening Systems - 3/4" Coins
Hook & Loop Fasteners
Velcro® Fastening Systems - Stick on Tape
Velcro Brand Sticky Back Fasteners
Velcro Brand Sticky Back Fasteners
Velcro Brand Sticky Back Fasteners
Velcro® Brand Industrial Strength Fastener