With Dartmoor's brand experience in designing some of the most reliable stems for hardcore users, they made something that suits those who are still in the gravity family but prefer endurance types of riding. Dartmoor aimed to offer a light but stiff stem so they went for an octagonal shape both on the inside and outside curves.
Short and strong are the most important features a modern gravity stem should have. The Viper is a truly compact stem with only 31mm extension but with a wide clamping area for both, the steerer tube and the handlebar.