The Shimano 105 ST-5800 left hand double 11 speed mechanical rim brake STI shifter is a high-quality component designed specifically for road and racing bikes. This shifter, from the renowned brand Shimano, is perfect for cyclists looking for precision and reliability in their gear changes. With a sleek drop bar design and a set that includes shifters for both the front and rear gears, this product offers a smooth and efficient cycling experience for riders. Its compatibility with 11-speed bikes makes it a versatile choice for those seeking optimal performance on the road.