ENSSO is a design brand established in 2014 in Los Angeles, California by designer Carlo Aiello.
Ensso Pen Uno is a most minimal pen designed to be both a pleasure to write with and beautiful to see. With only 5.3mm (7/32in) in diameter it is one of the slimmest pens ever manufactured, yet it is very comfortable to use because its holding barrel is slightly wider. This barrel also serves as a twisting cap that protects the pen tip when not in use. Pen Uno is precision-machined out of space-grade aluminum and anodized in distinct colors.