Pre Roll For Sale Moonrock pre rolled blunt is the hottest medical marijuana strain highly demanded in the market. If you are looking for moonrock pre rolls, Moonrock pre-rolls are made with 1.3 grams strain. A pre-roll is a  joint that has been prepared by a cannabis vendor, dispensary, or brand. Prerolls are consumer-ready and eliminate the hassle of grinding, rolling, and sealing cannabis flower into a joint. Prerolled joints are typically available in strain-specific flavors and vary in weight and potency.