The foundation of every Pearl flute is a patented Pinless construction, which eliminates the problems of traditional flute construction - protruding needles that snag clothing and give easy entry to perspiration and body acids causing corrosion and binding keys. Besides this unique pinless construction, Pearl flutes have additional bridge mechanisms that add strength to the entire mechanism. Plus, socket-head screws are inserted from the underside of the key work, preventing the entry of perspiration into the mechanism.