A shredder for shredding material, the shredder comprising a housing supporting two rotating shafts arranged parallel to each other, each shaft having a plurality of overlapping and offset transverse shredding blades along the shafts able to rotate on the shafts in a complementary fashion to shred the material thereinbetween, the shredding blade on each shaft nearest to the housing being an outermost shredding blade and having a gap between of the outermost shredding blade and the housing, wherein the gap at least partly comprises a V-shape.