As with most polyester and nylon threads around 70 denier the breaking strength tested 14 ounces. Suitable for tying from sizes 6-18 dry flies and nymphs. Colors: black, white, light olive, olive, dark olive, light brown, purple, brown, blue, dark gray, fluorescent orange, chartreuse, cream, yellow, orange, sand, rusty brown, fluorescent fire orange, fluorescent red, grey, fluorescent pink, fluorescent yellow, green, red. Per spool. Item# 992