They made a 28' and 33' offshore. DDC (Duo Delta Conic) is a Harry Schoell bottom design. Active Thunder uses this design as well. The MSWP uses the 28's on LOTO, though they are starting to replace them with OB CC's. Challenger bought the old Mariah molds when they went out of business in the early 2000's and reintroduced some of those models.