RIO MDC Sink Tips RIO's smoothest casting and most comprehensive series of sink tips. MDC Sink Tips feature a progressive density design that makes the line sink faster where it counts (closer to the fly), while providing the smoothest possible turnover in a sink tip. RIO MDC Sink Tips Specs: 12ft and 18ft lengths to match a wider range of rods Three sizes with color-coded rear loops cover RIO’s entire range of Scandi Bodies >#5/6 (white), #7/8 (blue), and #9+ (gray) Clear intermediate available in the H/I and F/H/I tips