RB4
Kemper RB4 · 89 mm (3 1/2 in) rib · Shaped steel · Trues the wall and compresses the surface
$0
An 89 mm (3 1/2 in) potter's rib for shaping and compressing on the wheel.
RB4 is the 89 mm (3 1/2 in) rib in Kemper's potter's rib range. A rib does two jobs at once on the wheel: it trues the wall and it compresses the surface, which is what closes up the throwing rings and reduces the chance of an S-crack later.
