This is done using smooth, stretchy, grippy materials. This type of plastic is made to be very grippy while also being very durable. The unicycle typically has broad tires with grippy profile, filled with medium air pressure. It is only used for putters, and provides a more flexible, grippy feel. The grippy pedals may have a tilt front contour (viewed from the side). Elite-X is very grippy plastic, but is more prone to wear. The album "Grippy Grappa" was reviewed in "The Guardian", "Les Inrockuptibles" and "fRoots".