Makellos Nails are made with ABS; a derivative from acrylonitrile, butadiene and styrene. It is recyclable materials with the most amazing mechanical properties known for resistance and toughness. According to MSDS, “There are no known human health effects aggravated by exposure to this product.” Makellos Nails are eco-friendly and safe for your natural nails. Our nails are flexible to enable a more comfortable wear and has a natural appearance. Wear can last up to 10 days. Each package of nails includes 24 nails in 12 different sizes (glue not included in package). The medium length is a natural free edge. Makellos Nails are good for a one-time use. Some individuals can get two sets of nail usage per package, depending on natural nail size. Our nails are pre-designed and ready-to-wear. Glue-on application is required. Brush-on nail glue sold separately. See product label for detailed instructions for easy self-application and removal process.