All mallets in the Andrew Markworth signature series are built using Promark's proprietary mallet technology. Rather than purchasing off-the-shelf parts and utilizing outdated manufacturing practices, all cores are injection molded in-house and threaded onto shafts using a patented insert design for unprecedented consistency and durability. In final assembly, all Promark mallets are wrapped using a state-of-the-art winding machine developed from the proprietary winding technology of the world's premier guitar string manufacturer. Appropriate for both indoor and outdoor marching percussion environments, this mallet series features a variety of core shapes, hardnesses, and materials to accommodate the needs of the competitive marching percussionist. All Promark keyboard mallets are designed and manufactured in the USA to the most stringent quality controls in the industry.