Every JO BEAU scarifier is by default equipped with Greenknives™ knives. Greenknives™ are the scarifier knives designed and patented by JO BEAU. The innovation lies in the fact that the Greenknives™ consist of knife holders and knives. The knives have four sharp edges. If a tip gets blunt, the knives can easily be rotated 1/4 tour on the knife holder, without having to (dis) assemble the knife shaft. This results in two unique features; a much higher efficiency because the knives last three times as long, and an unprecedented time saving (read: cost saving).