The Shimano Alivio BB-ES300 Hollow Type Bottom Bracket 73 x 118mm is a high-quality bottom bracket designed for optimal performance on your bike. With a hollow type design, this bottom bracket is lightweight yet durable, ensuring a smooth and efficient ride. Easy to install and compatible with a variety of bike frames, the Shimano Alivio BB-ES300 is a reliable choice for cyclists looking for a long-lasting bottom bracket solution.