You are buying 8 Ounces by weight of Potassium Carbonate. The item ships in an 8 Fluid Ounce by volume Polypropylene bottle. Potassium Carbonate (K2CO3); also known as Carbonate of Potash / Dipotassium Carbonate / Dipotassium Salt / Perl Ash / Potash / Salt of Tartar / Salt of Wormwood; has hundreds of uses. SHIPS FAST FROM CALIFORNIA, USA! 2-4 day transit time throughout the country. We ship three times a day; so your item is guaranteed to go out the very same day you place your order. Our bottles are made of sturdy polypropylene. The square, “space-saver” shape ensures that the bottles fit snugly on a shelf. The wide mouth makes for easy dispensing and stackability. To ensure a spill-free journey, we shrink-wrap the screw tops and seal the bottles in plastic.