Pro competition time trial tubeular for dry road surfaces.  The special silk fibre provides better traction and extra comfort at high tyre pressures, resulting in extremely low rolling resistance.  The tread provides excellent grip on dry and well paved road surfaces.  If you want to find out how fast you can go at Busselton, this is it.  Widths: 20mm.  700c only.  Weight 215g.  Tyre pressure 8-12 bar.