Can't remember what we called them but it wasn't any of these! Boondoggle, Gimp, Rexlace, Laynard | Plastic lace, Lanyard crafts, Lace crafts
tao Pipe 200 PCS Scoubidou Strings DIY Plastic Lacing Cord Handwork Gimp String for Jewelry Making in 20 Colors with 15 PCS Snap Clips and 15PCS Key Chain Rings : Amazon.co.uk: Home
Gimp Keychain also known as a boondoggle. Art class would never be the same again. : r/nostalgia