Use any size Floops marker with any size needle you prefer. The idea is for both needles to fit comfortably into the marker for easy sliding - but here are some recommendations:
Needle size (US) - Floops size
US 0 thru 4-ish (2mm-3.5mm) - Small
US 5 thru 9-ish (3.75mm-5.5mm) - Medium
Floops stitch markers won't get in your way!
They are as soft as your knitting and slip effortlessly from needle-to-needle. Terrific for those with orthopedic concerns.
Soft, pliant, stretchy - and beautiful!
Made in Vermont
One set includes 20 markers