Check the listing for details. Molecular Sieve [4A Pore Opening] 99% Laboratory 12 Oz in 2 Bottles. Condition: New. Listed at 39.99 USD. MOLECULAR SIEVE. Weight: 12 Ounces (340 Grams) Purity: 99% Pure Grade: Laboratory Texture: 8x12 Mesh Beads CAS Number: 1318-02-1 You are buying 12 Ounces of Molecular Sieve. The item ships in 2 polypropylene bottles. Molecular Sieve (4Å Pore Opening), also known as Synthetic Zeolite, 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.