(some surcharges apply for larger items to HI, AK & PR). The Dual Sport Kit is our most versatile, as it works well on the road and off the road. This kit using our Dual Sport mirror is our go-to for dualsport and dirtbikes, offering great visibility with a low profile. Dual Sport Mirror (2). Made from super tough glass reinforced zytel. Housing guaranteed against breakage. Reflector Diameter: 4 (100mm). Overall length: 6 (150mm). Convex lens meets SAE and CE specifications. Recommended for applications where mirror will be folded down often. Doubletake’s NEW 3.5 (150mm) Arm (2). Our new Doubletake 3.5 arm is perfect for aggressive riders – long enough to see, but small enough to tuck away. Length center to center: 3.5 (90mm). Length overall: 4.5 (115mm). Arm weight: 70 Grams. Material: A380 Die Cast aluminum. Better hold, less effort. The whole system has been engineered together to keep the mirror from moving, except when it has to in an impact. The clamping surface at the base has radial ridges to hold the ball more securely. These ridges prevent the arm from unintentionally rotating relative to the base, but without mechanical interference that could be damaged under impact. Because the ball diameters are different, the clamp is located off-center toward the mirror. The larger base diameter creates more stiffness at the bottom, and the offset clamp grips the mirror tighter to equalize rigidity. Our low profile thumb nut is 25% longer to make adjustment easy even wearing gloves. Mirror end 1″ socket works with any 1″ ball accessory (GPS, Camera, etc). Requires Doubletake ball kit for base. Doubletake’s NEW Base Kit (2). The new Doubletake ball is oversized, and high quality nitrile rubber surrounds an aluminum base that won’t degrade under extended compression. The Doubletake Base Kit includes bolts to thread into every application, without adapters. 1.125 Ball Stud. 10mm x 1.25 Bolt Long. Extension (if needed to clear controls). 10mm x 1.25 Bolt Short. 10mm x 1.25 Reverse Thread Bolt. 10mm x 1.5 Short Bolt (BMW Only). Weight ball only: 20 grams. Weight ball kit: 110 grams. Materials: Billet Aluminum, Nitrile, hardened Steel. Diameter: 1.125 (29mm). Height: 1.37 35mm. Extension: 0.78 (20mm). Every ball kit includes 4 bolts to allow fitment to any bike and eliminate unsightly adapters. Our ball is 1.125, and even that small increase in diameter makes a big difference in rigidity. This means you don’t have to overtighten the arm to keep it from moving while riding. Our aluminum-filled base ball, coated with high-quality nitrile rubber won’t degrade under extended compression. You won’t have to repeatedly adjust your mirrors, because both ends of the system are designed to last. We include a lock washer that secures the ball in relation to the bike.