The Hydra Needles Derma Roller is a skincare tool featuring 64 micro-needles at 0.5mm length. This derma roller is designed for at-home microneedling treatments to improve product absorption and stimulate collagen production for better skin texture and appearance. Since this is a personal care device that creates micro-channels in the skin, proper sanitization and careful usage are essential. The 0.5mm needle length is considered suitable for at-home use. The device should be used with appropriate skincare products and following proper cleansing protocols. As with all microneedling devices, users should follow the included safety instructions and usage guidelines.