Autoclave safe Bioflex solid labret post, these can be cut to custom size but MUST BE THREADED with the PTFE TOOL (sold here). The base on 14G is 5mm. Can pair with any acrylic external thread 14G top. If you don't have a tool you can usually just forcefully thread on the ball to etch in the threading on the post. These long lengths are good for cheek and dimple piercings.