1. Crusher prunings comprising a rotor (1) inside a chamber, wherein the rotor (1) comprises: - a plurality of shafts (2) on the periphery of the rotor (1), and - a plurality of blades (3) such that each blade (3) is connected to two shafts (2) adjacent and where each blade (3) comprises a head (7) which in turn comprises at least one projection (8) in a side of said head (7).
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