A magnetic blade assembly (104; 204; 304; 404; 504; 604; 704; 804), comprising: a first blade (114; 214; 314; 414; 514; 614; 714; 814) comprising a first blade edge (168; 268; 368; 468; 568; 668; 768; 868) having a plurality of teeth (152; 252); a second blade (112; 212; 312; 412; 512; 612; 712; 812) comprising a second blade edge (166; 266; 366; 466; 566; 666; 766; 866) having a plurality of teeth (150; 250), the second blade edge being parallel to the first blade edge; wherein the blades oscillate relative to the other; and a blade guide assembly (286, 386, 486, 586, 686, 786, 886) captured between the first and second blades, the blade guide assembly maintaining a relative position of the first blade edge relative to the second blade edge, the blade guide comprising: a guide member (138; 238; 338; 438; 538; 638; 738; 838) including a base and a cross-portion (170; 270, 470, 570, 670, 770, 870), the cross-portion being captured between the first and second blades, the cross-portion having a first side adjacent to the first blade and a second side adjacent to the second blade; and a magnetic assembly comprising a plurality of magnets (176; 276; 376; 476; 576; 676; 776; 876) extending along the cross-portion of the guide member between the first and second blades; wherein the magnetic assembly generates an attractive force between the blade guide assembly and the first blade; characterised in that the cross-portion of the guide member is a ferromagnetic material that is magnetized. a first blade (114; 214; 314; 414; 514; 614; 714; 814) comprising a first blade edge (168; 268; 368; 468; 568; 668; 768; 868) having a plurality of teeth (152; 252); a second blade (112; 212; 312; 412; 512; 612; 712; 812) comprising a second blade edge (166; 266; 366; 466; 566; 666; 766; 866) having a plurality of teeth (150; 250), the second blade edge being parallel to the first blade edge; wherein the blades oscillate relative to the other; and a blade guide assembly (286, 386, 486, 586, 686, 786, 886) captured between the first and second blades, the blade guide assembly maintaining a relative position of the first blade edge relative to the second blade edge, the blade guide comprising: a guide member (138; 238; 338; 438; 538; 638; 738; 838) including a base and a cross-portion (170; 270, 470, 570, 670, 770, 870), the cross-portion being captured between the first and second blades, the cross-portion having a first side adjacent to the first blade and a second side adjacent to the second blade; and a magnetic assembly comprising a plurality of magnets (176; 276; 376; 476; 576; 676; 776; 876) extending along the cross-portion of the guide member between the first and second blades; wherein the magnetic assembly generates an attractive force between the blade guide assembly and the first blade; characterised in that the cross-portion of the guide member is a ferromagnetic material that is magnetized. a guide member (138; 238; 338; 438; 538; 638; 738; 838) including a base and a cross-portion (170; 270, 470, 570, 670, 770, 870), the cross-portion being captured between the first and second blades, the cross-portion having a first side adjacent to the first blade and a second side adjacent to the second blade; and a magnetic assembly comprising a plurality of magnets (176; 276; 376; 476; 576; 676; 776; 876) extending along the cross-portion of the guide member between the first and second blades; wherein the magnetic assembly generates an attractive force between the blade guide assembly and the first blade; characterised in that the cross-portion of the guide member is a ferromagnetic material that is magnetized.