All our Cartridges, regardless of configuration, come in our defaulted standard #12 gauge (0.35mm). All needles labelled as BP indicate they are Bugpin which is #10 gauge (0.30mm). The only cartridge configurations that we offer outside of these gauge sizes are our X-Tight Round Liner Series, which also come in #08 gauge (0.25mm) and #06 gauge (0.20mm).