Sea shells on the sea shore...
These markers measure approximately 5/16" (8 mm) long by 5/16" (8 mm) wide, and weigh less than a gram.
They are shown on an 8 mm ring and a 12 mm lobster clasp. The 6 mm ring comfortably fits knitting needles size US4 and smaller. The 8 mm ring comfortably fits knitting needles size US6 and smaller.