Regular size fits up to an 8.00 mm /US 11 needle. 20 stitch markers
Jumbo size fits up to 12.75 mm /US 17 needle. 12 stitch markers
Markers with clip fits up to 10.00 mm /US 15 needle. Writing reminders becomes easy, as the clip on the bottom allows you to write a note, and attach it to a stitch. 6 stitch markers, and a perforated notepad included.