The Knitter's Helper Silicone Stitch Markers
These stitch markers are flexible and come in three sizes. They work well for marking beginning of round and pattern repeats. Approximately 30 markers per pack.
Please note that the mixed ones are always a different combination of colors.
Also available in a box of 300.
Small 5mm: Needles sizes US 0-4
Medium 10mm: Needle sizes US 3-8
Large 13mm: Needles sizes US 7-11
If you need larger stitch markers, check out Clover's Jumbo Stitch Markers.