Made of nylon coated steel - they cling to magnets
Split Ring markers - hook onto stitches
Triangle stitch markers accommodate up to US 9 / 5.5mm needle.
Small stitch markers accommodate up to US 7 / 4.5mm needle.
Original stitch markers accommodate up to US 13 / 9mm needle.
Jumbo stitch markers accommodate up to US 19 / 16mm needle.
 
each style includes 24 markers - 4 each of 6 colors
120 total markers