| Flex | Weight | Torque | Length | Launch | |
| Black GEN 4 60 | 5.5 | 60g | 4.0° | 46″ | Low-Mid |
| Black GEN 4 60 | 6.0 | 60g | 3.5° | 46″ | Low-Mid |
| Black GEN 4 60 | 6.5 | 60g | 3.3° | 46″ | Low-Mid |
| Black GEN 4 60 | TX | 65g | 2.5° | 46″ | Low-Mid |
| Black GEN 4 70 | 5.5 | 67g | 3.8° | 46″ | Low-Mid |
| Black GEN 4 70 | 6.0 | 68g | 3.3° | 46″ | Low-Mid |
| Black GEN 4 70 | 6.5 | 70g | 3.1° | 46″ | Low-Mid |
| Black GEN 4 70 | TX | 75g | 2.3° | 46″ | Low-Mid |
| Black GEN 4 80 | 6.0 | 80g | 2.9° | 46″ | Low-Mid |
| Black GEN 4 80 | 6.5 | 82g | 2.4° | 46″ | Low-Mid |
| Black GEN 4 80 | TX | 82g | 2.1° | 46″ | Low-Mid |
New for 2023 ROJECT X HZRDUS BLACK 4TH GEN. DRIVER SHAFT. What separates the HZRDUS BLACK 4TH GEN. from the original is a Dual Torsional Design that runs throughout the shaft. Dual Torsional Design is a more efficient use of the torsional plies throughout the shaft. New look, new tech, trusted HZRDUS performance. Introducing HZRDUS Black Gen 4, our flagship product, and the most advanced HZRDUS yet. Utilizing a new Dual Torsional Design throughout the shaft, HZRDUS Black Gen 4 creates optimized torques and maximum stability while featuring the classic HZRDUS Black profile of stiff butt, x-stiff midsection and stiff tip, suited for an aggressive swinger.