R42 Peppermint (Xtra Strong) and R42 Green Mint (Xtra Strong) in April of last year, but it appears as though these products have been discontinued and new super strong versions of these products have been launched. In May of last year I reviewed R42 (Cool Mint) Super Strong, which had a taste of peppermint. It looks as though the R42 line is focusing on the "super strong" level of products at the 26mg/g (2.6%) nicotine level.
If you like the spearmint flavor and want something really strong, this is definitely worth a try. It's much too strong for me personally, but the nicotine extremists of the world will probably enjoy this product!