Hollow:~ Hollow stems are cold forged from the highest quality 6061-T6 aluminum available. Featuring an open skeletal design and a dual mid-bolt wedge mounting system, they are lightweight yet maintain a very high level of strength. A 53-millimeter extension stem weighs just 215 grams/7.6 ounces.
• To ensure proper clamping force, the stem must be mounted on a fork with at least 40 millimeters of exposed steerer tube
• Meets or exceeds ENBMX Category 1 standards
• Not compatible with carbon fiber steerer tube forks
• Weight: 218g