Very strong, self-adhesive velcro for powerpads (soft side)
VELCRO Brand 4-in Black Industrial Strength 4In X 2In Strips Heavy Duty (2-Pack) in the Specialty Fasteners & Fastener Kits department at Lowes.com
Amazon.com: Double Sided Sticky Pads, 10 Pack 60mm Round Black Sofa Cushion Velcro Sheet for DIY Craft, Tools Hanging or Other Cushion Anti Slip Use : Arts, Crafts & Sewing
VELCRO ® Brand Mated Circles On A Roll - FASTENation, Inc
VELCRO® Stick on Pads Heavy Duty Self Adhesive Hook & Loop Sticky Fasteners Dots | eBay