Our two-piece custom Stem Cap System consists of a CNC machined aluminum Stem Cap Base and a CNC machined durable plastic snap-on Stem Cap Cover. The whole system weighs just 7.6 grams, lighter than even your standard headset cap. Clean and simple, with infinite customization options. Whatever design you can fit onto our snap-on Stem Cap Cover, we can print. They're so easy to change out, you can have a different one for every day of the week.