ZTTO bike 12 Speed Cassette 11-28T sprocket 12v SLR cassette Profession Silver. ZTTO 12 Speed Cassette Road bike 11-28T UltraLight CNC made 12s 11-28 sprocket for RED 12v SLR lightweight cassette.COMPATIBLE WITH ROAD BIKE 11 SPEED HG SYSTEM. This item is in the category "Sporting Goods\Cycling\Bicycle Components & Parts\Cassettes, Freewheels & Cogs". The seller is "robot7700" and is located in this country: CN. This item can be shipped worldwide.