From Fripperies & Bibelots, these silver or gold coloured stitch markers come in a variety of shapes and sizes. Lightweight and snag free they are an economical option when you need lots of markers.
The mini sizes have approximately 15 in a bag, the standard size at least 10. An empty storage tin is also available.
In general, mini Simple Solids fit up to 4mm needles (except the Mini Gold Honeycomb which will fit up to 6.5mm), standard Simple Solids fit up to 8mm needles.