F16 customizes comfortable and precise frames for teenagers using 3D scanning, 3D printing, and parametric design. There are 17 frame colors and two types of temples. It is equipped with clip-on sunglasses, the first of its kind produced with 3D printing technology which perfectly fits the frames. The glasses, as a unibody, are easily put on and removed. They are environmentally friendly as production is made-to-order. This is the only company to combine 3D printing and virtual trial with eyewear production. Similar products only come in a single size, while we can supply unlimited sizes. We also assist optical shops in making tailor-make eyewear for customers.