Xiaomi Mijia metal sign pen has 14cm length, 9.5mm diameter, it adopts high sophisticated metal kits, aluminum body, adopting oxidation of the blast anode craftsmanship, which is durable, anti-corrosion, available for golden and silver two colors. This pen continues 180 degrees rotation. It can be automatic recoil when touching the pen lightly. Refill is from PREMEC Switzerland. It adopts high sophisticated metal kits.