XLC A-Head stem AntiShock ST-M21A patented new design: Eliminates fatigue and pain in the arms, shoulders, wrists and neck. Absorbs vibrations and optimizes the uniform pressure distribution. Allows a horizontal damping angle of up to 2 ° Material: Alu 2014, 3D MMORPG forged Angle: 6 ° Weight: approx 198g (100mm) EN-Road / EN-MTB