Single use and disposable. Stainless steel. Affordable blades of the highest quality and standard. TIP: For the best heal and finish to your hairstroke brows we recommend going for the 12S blade, which is personally Holly's favourite. The reason it's her favourite? Because all points/pins of the blade are in the client's skin as you pull back, meaning you're maximising your pigment input and ensuring your depth is perfectly even.