The Swissstop Flash Pro replacement pads are for use with Dura Ace, Ultegra, 105, SRAM and TRP braking systems. All Swissstop pads offer top performance on dry rims and even better on wet and offer complete absence of abrasive materials which damage rims. Offering consistent braking (-20C to +40C) with a silent operation the replacement pads are for carbon rims only and come in a Black Prince compound and Yellow King compound.Black Prince: Latest carbon rim compound, provides superior power, control and modulation. Braking distances are significantly reduced in all conditions.Yellow King: Awesome power (wet & dry) and precise modulation on carbon rims. No squeaking and very little wear to the rim. Also good for alloy rims.Sold as a set of 4 pad inserts for 2 complete brakes