The french nail guides are made of white opaque stickers, that are quality and easy to use.The nail art stickers can use a variety of nail polish, just stained as correct direction, the nail polish would not not penetrate below. Using steps: 1. Apply based polish and let it dry completely. 2. Pick off the nail art sticker gently and put it on nails. 3. Coating another color nail polish. 4. Dry and remove the stickers cover.