LYKKE Cypra Copper Needles are made from 100% copper and will acquire a lovely soft patina with continued use. However if you prefer your copper needles to remain bright and shiny, LYKKE has designed a polishing cloth. LYKKE's Metal Polishing Cloth works very much like the polishing cloth that accompanies fine jewelry pieces. Their two-part system contains an inner cloth that is treated with a trade-secret formula to remove tarnish and to restore luster without scratching or removing the finish. The 100% cotton outer cloth provides a gleaming shiny finish