The click pens are built around a Schmidt click mechanism. There are two basic styles. The “Long Click” and the “S Click”series.
The Long Click style (shown above) is based on an 8mm tube but it can be customized and built on a 3/8 or 10mm as well. Contact me for a quote on larger Tube sizes.
The “S Click” series pen below (s2004) is built on a 10.5 mm tube. It can have a solid silver lower unit or it can be built with an 8mm lower tube with a silver nosecone.