Bead Chain eyes for fly tying
You can use your bath chain, but it won't be in as many sizes or as many colours as these.
The red is ideal for damsels
X-Small 2.0mm, approx 60 pairs of eyes (31cm)
Small 2.4mm, approx 47 pairs of eyes (31cm)
Medium 3.1mm, approx 34 pairs (31cm)
Large 4.0mm, approx 29 pairs (31cm)