GREAT QUALITY MATERIAL — The tattoo ink caps is made of high-quality plastic, waterproof and durable. SIZE - This is #8 small tattoo ink cup; 3 sizes #8 #11 #15 for your choice (not mixed sizes) USAGES - This tattoo ink cups perfect for used to hold pigment or ink for tattoo, which can prevent the pigment from spilling. EASY TO USE - Perfect for used to hold tattoo pigment or ink. Easy to clean and store. With these tattoo caps, you don't need any ink stands to hold ink cups. SATISFIED PROMISE - If for any reason you are not fully satisfied about the tattoo ink caps, just simply return it for a full refund or exchange.