Abstract: A guide tube for tattoo machine needles has a through hole slidingly engaged, in use, by a rod, which carries the needles; the tube has at least one slot, which is transversal to the axis of the hole to reach beyond said longitudinal axis; in use, an elastic band is provided in the slot to come in contact against a zone of the rod and radially force the rod and/or the needles against a surface of the hole close to the outlet of the hole.