Glass stitch markers - Shop
These stitch markers are make by combining melted glass and wire - so the ends which could catch on your knitting are completely enclosed and the markers are smooth and snag free.
The stitch markers will fit needles up to 8mm.
Stitch markers have been kiln annealed for strength and will stand up to years of normal use. However glass can chip or crack, so these markers should never be given to children. Frosted beads have been tumble etched to create a matt surface - similar to the glass you can find on the beach.