Check the listing for details. Gypsum, 4oz, Reagent Grade, 97% Pure, Sturdy Bottle SHIPS SAME DAY. Condition: New. Listed at 6.99 USD. Gypsum CaSO4·2H2O Weight 4 Ounces Volume 4 Fluid Ounces Chemical Formula CaSO4·2H2O Purity Ultra-Pure 97% Grade Reagent Grade Consistency Fine Powder CAS Number 10101-41-4 You are purchasing 4 Ounces (by weight) of Gypsum. The item ships in a 4 Fluid Ounce Polypropylene bottle. Gypsum; also known as Calcium Sulfate (Dihydrate); has hundreds of uses. For more information, go to: http://en.wikipedia.org/wiki/Gypsum FREE EXPEDITED SHIPPING We ship THREE TIMES A DAY, 7-Days a week. Your item is guaranteed to be in the mail the SAME DAY you place your order. Transit time from California is 2-4 days throughout the USA. Our bottles are made of sturdy polypropylene. We shrink-wrap the screw tops and seal the bottles in plastic to ensure a spill-free journey.