Selectpart HD series friction pads to fit the following Montalvo brakesSelectpart HD Series friction pads are 3.25″ (82.6mm) diameter. The following chart details available friction pads based on Coefficient of Friction* and Material Composition.Selectpart #Montalvo #COFEdge ColorMaterialDescriptionSDSPrice RequestH302HHD4512HighNoneCarbon base with various phenolic fillers and bonding agents.Standard material for most applications. One of the best pads for noise problems.Go To FormH301HHD4511HighOrangeCarbon base with various phenolic fillers and bonding agents.High torque, normal speed. Suits a variety of applications. Tends to glaze at intermediate to high temps and low pressures. May be unstable above 350F. High propensity to make noise.Go To Form*Coefficient of Friction (COF) rating is approximate and may vary with changes in environmental conditions.