Core length: about 2.5 / 4/5/6 / 7cm /9cm/15cm/20cm,These wax candles have many features that you can purchase to install on your candle. These products are both economical and environmentally friendly. After all degreasing treatment, the outer layer of wax, compared to ordinary wick wicks, not easy to bend when ignited And if you hate throwing out candles. These candle wicks make it so you can prolong the life of your candle waxes. you can still use the left over so its not wasteful. Nothing ever goes to waste!!! And if you hate throwing out candles. These candle wicks make it so you can prolong the life of your candle waxes. you can still use the left over so its not wasteful. Nothing ever goes to waste!!! 100 x candle wick.syi