The Mast Pro Tattoo Cartridge Needles are a set of 20 high-quality needles designed for tattooing. Made in China, these needles are standard round liners with a size of #12 and a length of 0.35 inches. Perfect for professional tattoo artists looking for reliable and durable needles to create precise and detailed designs on their clients. These needles are a must-have collectible item for any advertising enthusiast.