These ribs are all you need.They come in 4 colours and 6 shapes. The colours denote stiffness. Red is extra soft, yellow is stiffer, green is stiffer still, and blue is extra stiff.
For example if you want an extra hard, small rib, you would choose blue #0.
These ribs do not wear out and break apart like rubber ribs.In fact they get sharper as they are used.