Buy Brass Knuckles carts. Brass Knuckles cartridges provide you with ONE full gram of super premium concentrate for the ultimate flavor experience at hand. However, Our carts connect with 510 thread batteries and are made with superior Quartz. Available in Indica, Sativa, and Hybrid cartridges. We also work exclusively with top strains including: Skywalker OG, Gelato, GG4, GSC, Strawberry Cough, Sour Diesel, and more. Our cartridges are in a class of their own.