This pack of 10 replacement wicks is made from 100% round cotton, each measuring 0.15 inches in diameter. The wicks are unprimed and lead-free, designed to soak up ethyl alcohol and burn with a cooler flame than propane or butane burners. A change of fuel type requires a change of wick. Suitable for use with denatured alcohol (95% or higher), Eisco Labs alcohol lamps (CH0533), Tiki torches, oil lamps, citronella lamps, paraffin oil lamps, and as automatic watering wicks for hydroponics. Trim wick to no more than 2cm. Use under adult supervision; never leave flame unattended.