R-290 Refrigerant -Package of 6 - Newer Product for Refrigerant Market R-290 refrigerant grade propane - Package of 6 Cylinders - Each weighing 370 grams / 13.05 ounces Increasingly popular due to low environmental impact This product is at least 99.5% pure with minimal levels of impurities (moisture and hydrocarbons) Will be shipped FedEx Hazmat, requiring a signature when delivered!