D12 is a fully carbon built ocean rowing boat for solos and pairs. In 2020 Mark Slats and Kai Weidmer set the world record crossing the Atlantic in a D12: The boat is tried, tested and has proven itself as the fastest design on the ocean.
D34 is an ocean rowing boat for 3, 4 and 5 persons. It is exactly the same design as the D12 just a bit longer. Another fully carbon built boat which makes D34 very fast, very light and very strong. The only fully carbon built boat on the market.