Stronglight Twister ISIS Bottom Bracket Titanium NOS/NIB unopened. 108mm BSC variant. Aluminum cups and body. Hollow titanim (TA6V-GR5) axle. Sealed bearings double line assembly. Listed weight 180 grams. This lightweight bottom bracket reviews well for the ISIS mount. Only the SKF ISIS (steel) bottom bracket reviews as well (at 291g, if you can find one in BSC).