Designed to fit 12mm diameter (2ml) vials; 50 vial capacity (vials not included). Great for storage, transport and organization. Made from lightweight yet durable high density waterproof, non-scratching, anti-rattle, non-toxic 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 7.5" x 3.9" x 1"