Wildcat. Of course the Titan Highline Basic Micro labret piercings are available as substitutes without balls, too.
You can choose exactly those balls and attachments from the Wildcat assortment that fit your style. The labrets have a strength of 1.6 mm. The article can, like all basics, be sterilised in an autoclave and due to the skin friendliness of the material it is absolutely harmless to allergic persons.