Designed to fit 4 13mm diameter tubes and 28 10mm diameter tubes; 32 tube capacity total (tubes or vials not included). Great for storage, transport and organization. Made from lightweight yet durable high density waterproof, non-scratching, anti-rattle, black foam material. Note: Avoid halogens, strong oxidizing agents, benzene, petroleum ether, aromatic and chlorinated hydrocarbons. Easy to clean (can be washed and rinsed, top rack dishwasher safe). Measures approximately 6" x 3.25" x 1".