Check the listing for details. WALNUT SHELL ABRASIVE 16-19 LBS #30 GIT SANDBLASTING MEDIA SANDBLASTER SAND. Condition: New. Listed at 44.99 USD. This listing is for a 16-19 pound box of #30 grit, (medium) black walnut shell, cabinet blasting abrasive. The product will vary in density. It is sold by volume and you will receive a full 15 x 15 x 6 Large Flat Rate USPS box. It is excellent for all general purpose paint, oil, dirt and other cleaning applications on metal and plastics without damaging the substrate or removing metal. Excellent for blasting under the hood of a used automobile to remove loose paint, flaking rust, oil, dirt and other deposits on almost anything under the hood without causing any damage to the components. Comparable to plastic blasting at a fraction of the price. Reusable and biodegradable. Also used for brass polishing before reloading.