WINMAX W4 Compound: Semi Metallic Friction: 0.37 – 0.40µ Temp range: 50 – 700degC Track and enthusiast racing. Ideal for small to medium track cars Low-Mid level motorsport WinmaX W4 brake pads are a semi-steel based compound suitable for track use in low to mid level competition environments. Used in racing conditions by small cars and heavier cars doing limited laps. W4 is ideal for the track enthusiast wanting bang for bucks! Note, W4 is not stocked in many shapes and mainly used in Hyundai Excel X3 Racing. Other than this application, W4 is generally special order only. What you get: 1 part number = 1 set of pads. In most cases this is 4 pads per box. If your calipers take more than 2 pads per caliper (E.g Audi RS4), the part number you buy will include all the pads you need to service the axle set of calipers. Also included is bedding instructions to help you get the most out of your new pads. Brake pad product notes: Shims and Wear sensors Our brake pad products are designed for high performance and competition use. Therefore, we do not always provide ancillary parts such as wear sensors or anti-squeal shims on some of the WinmaX and CIRCO range. Ancillary parts are provided in some cases depending on the pad specification and fitment. Anti-Squeal shims are available for some shapes as separate items on this website. If you are unsure about any of this, please contact the us for confirmation. Fitment FRONT, REAR or UNIVERSAL? Our brake pad products are engineered to replace OEM parts with higher performance friction. Many pad shapes are designed to be installed in only front or rear. However, there are many pad shapes in the automotive world that are shared across multiple vehicle and caliper makes and models. In many cases these shapes are installed in the front on one vehicle, but the same shape is used in the rear of another. In other cases, the same pad shape is used in both front AND rear. If a brake pad is known to be used for front and/or rear, we refer to it as UNIVERSAL. If unsure about the fitment when purchasing, please check with us.