Firebolt Cotton by Vapefly VapeFly Sale! from £4.99 GBP /per Type 3mm Mixed 2.5/3/3.5mm Produc variants 3mm Mixed 2.5/3/3.5mm Qty. Add to Cart Couldn't load pickup availability Refresh Vapefly Firebolt Cotton Laces are pre-sized laces of cotton ready to use. Made from organic Japanese cotton. Around 20 laces per pack.