You are purchasing 100 grams of Ultra Pure Sodium Iodide (NaI). It meets Reagent ACS specs and is 99.7% pure minimum. The material is a course, granular crystal. Buyer must be 21 years of age. Buyer assumes all liability for the use of this item. Buyer agrees to not hold the seller or Amazon liable for the use of this item. Buyer agrees to use this item in accordance with all local, state, and federal laws. This is for laboratory and scientific use only! NOT for food or drug use. Shipping will comply with all USPS regulations. May be harmful if swallowed.