Ground Walnut Shell Media Abrasive 12-20 Grit For Tumbling, Vibratory, Or Product Details 12-20 Grit Crushed Walnut Shells, 4 lbs. Walnut media blasting is especially effective when you want to clean paint, grease and other dirt from the surface of a material but maintain the integrity of the substrate materials. Cleans and polishes glass, fiberglass, wood, plastic, stone and soft metals. For use with blasting or vibratory tumblers. It?s environmentally friendly and 100% silica free. ALLERGY ALERT! This media contains walnuts. 12-20 Course Grit Walnut Shell Abrasive Media for Tumbling, Vibratory or Blasting Walnut Shells Polish Surfaces without Damaging the Substrate 100% Crushed Walnut Shells Use Low Pressure 20-60 PSI for Soft/Sensitive Materials. Exceeding 80 PSI Lowers the Longevity of the Walnut Shell Media. Environmentally Friendly. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.