The Shimano EW-SD300 Di2 Electric Wire is a 1000mm cable crafted for Shimano's Di2 electronic shifting systems. It features built-in routing for a neat installation, improving your bike's appearance. Its durable design ensures dependable performance, making it a crucial part for cyclists aiming to enhance their electronic shifting. Ideal for upgrades or replacements, the EW-SD300 offers an excellent balance of length and functionality.