The Shimano Ultegra BR-6403 brake pads and holders are of good quality and suitable for older models of Shimano road brakes.

Good braking power, even in bad weather
These brake pads are suitable for Shimano Ultegra BR-6403/1055, among others, and feature an optimal compound that guarantees the best possible braking power. Even in wet conditions, the water is drained from the rim through the channels so that you can continue to brake properly.

Compatibility
BR-6403
BR-4400
BR-3300
BR-1055
BR-A550
BR-A450
BR-A416
BR-A410
BR-A350
BR-A250