Ergonomic design: The MTB Bicycle Bar Ends use ergonomic technology to adjust riding posture, reducing joint and muscle discomfort. Their specially shaped profile corrects hand position and aligns forearm joints for more comfortable riding. Enhanced safety: Builtin fluorescent effects automatically light up at night, providing a visible glow for night rides. Lightweight material: Made from a nylon fiber composite, they help reduce overall bike weight and support a faster feel. Each pair weighs 127 g. fit: Compatible with handlebars sized 8 22.2 mm. The extended bar ends come in a sleek black finish and are designed to improve cycling efficiency while helping prevent joint and muscle pain. Use scenarios: Long MTB climbs and extended rides: improved posture and reduced fatigue on wrists and forearms. Rough offroad or technical trails: enhanced leverage and efficiency for better control. Night rides: glowinthedark feature increases visibility and safety while riding.