The Master Cam Size 4 is a flexible, single-stem unit with an optimized cam angle for increased holding power. The Ultralight Master Cams are twenty percent lighter than the originals. If you carry a double set of cams, the weight savings is the same as a twelve ounce canned beverage of your choice. When compared to other brands, the weight savings can be much more. The new shark fin tooth pattern gives optimized bite in soft rock.