The STX Hammer is a new head that is geared specifically toward defensive players. It has beefed up sidewall construction to make it the most stiff and durable head I have ever used or reviewed. The Hammer U is an X spec head and is legal for all levels of play. It features a relatively wide face shape ideal for defensemen. It also features STX's C-channel technology to keep the head stiff.
STX Hammer U Tutorial: Mid Pocket 15mm East Coast Mesh
STX Hammer U Mid Pocket w/ Pattern 15mm East Coast Mesh