Lefon Protective Pair Bike Handlebar Grips Bicycle Cycling Mountain Bike MTB Ergonomic Horns provide extra location for hand relief, shaped to ergo fit the rider's palm and thumb to minimize fatigue, discomfort, or numbness from long or rough rides Engineered optimal rubber elasticity and premium aluminum alloy enhanced comfort, non-slip traction and shock-absorbing. Stainless steel lock ring screw, anti-rust and durable, survives long rides under rough weather conditions,precisely machined to secure from sliping Easy to install and you can freely adjust the best angles for your preference, just need a small screw driver(package included) and two minutes to handle Fit for most regular bicycle , make sure the length of space at the end of the bar is equal to or longer than the length of the bike grip before installation.