uses a patented Wedge Pin with a reverse slope. The Wedge Pin engages the Top Cup and Bottom Cup entirely through its vertical surface, ensuring that the Mouthpiece is properly seated on the Top Cup and Bottom Cup while the Wedge is engaged. The compression area of the Mouthpiece connector is dramatically increased by reversing the lobes, thereby providing greater mass area at the bottom of the Mouthpiece. Our given Ledger End is designed utilizing the finest quality material and advanced technology. This Ledger End is carefully checked on set quality norms that assure its quality and strength. Queen Group will give you a perfect product, along with fast and knowledgeable service. You will know where to look for any other scaffolding or accessories that you might be in need in the future.