3-D Zots (aka printers' snot), clear, pack 200 for about $4 USD.
High tack, 1/2" diameter, 1/8" thick. Found in scrapbooking supplies
while looking for archival double stick tape for my son's project.
What are they used for? Found out they prop up earrings and other
jewelry, transparent stones, and with a little judicious placement
you can't see them. Things stay put!
Looking at other Zots products, but this is the best so far.