For all your traditional Wet Flies. Wood spool is standard size and can be used in your normal tying bobbins. Good sub for Pearsalls Silk Thread which is no longer available. 100 meters per spool and available in 16 colors: Claret #1316, Primrose #15, Green #2126, Golden Olive #2400, Ash Grey #3056, White #4096, Black #4106, Brown #4124, Royal Blue #4924, Light Olive #524, Golden Yellow #544 , Orange #625, Burnt Orange #633, Red #925. Item# 2038