Medium Triangle Stitch Markers
These are my workhorse stitch markers! I find them comfortable to use down to lace weight yarns and up to bulky yarns although the manufacturer specifies a narrower range.
Why? Because these are light weight plastic that doesn't weigh down a thinner yarn, and because the triangular shape allows you to keep it out of your way.
Another perk of these stitch markers is that they have a little bump that makes them easy to pick up on a flat table (or floor--it happens to us all.)
The package contains 16 yellow or purple triangular stitch markers and a vinyl pouch to store them. Manufacturer recommends them for US 9 (5.5 mm) to US 10.5 (6.5 mm) needles, but I use them for almost everything.