Designed to fit tubes from 11mm to 17mm in diameter; 16 tube capacity (tubes or vials not included). Great for storage, transport and organization; Each holder has 16 assorted holes and a convenient extra slot! 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 6.6" x 4" x 2".