These stitch markers have a unique triangle shape that sets the perfect eyelet for inserting the needle in the marker as you pass it from one needle to another.
Extra small (purple & fuscia) for needles size 2 - 3.5 mm (0 - 4 US)
Small (pink and lime) for needles size 3.75 - 5 mm (5 - 9 US)
Medium (yellow & purple) for needles size 5.5 - 7 mm (9 - 10.75 US)