This stem cap is where your bike fashion sense and the weight weenie in you collide. This Ultralight and ultra-sleek stem cap integrates a 5mm, 10mm or 15mm headset spacer with your stem cap in finely machined piece. Why have extra steerer tube requiring spacers on top of your stem you ask? Well, many carbon steerers require that the steer tube extend above the stem. Also, riders may want the flexibility to move handlebar height up and down for different types of riding or for bike re-sale. - Design and manufactured in Minneapolis, MN USA - 1 1/8" top (straight 1 1/8" or 1 1/2" to 1 1/8" taper) steerer tubes only - 6061-T6 aluminum - 5mm internal cylinder wall height - Black aluminum bolt included Total weight (cap + bolt): 5mm= 12g. Compare to a standard flat stem cap and steel bolt at 20 grams + spacers add even more.