Abstract: Slotted shadow mask for a color picture tube mounted on an L-section frame having a lateral wall and a radial wall which are integral and extend toward the tube axis. The mask is bordered by a skirt having an axial generatrix, whose height is preferably between a third and a quarter the height of the lateral wall of the frame and whose thickness is less than ten times the thickness of the mask. The free inner end of the radial wall of the frame is bent in the opposite direction to the mask in order to form a stiffening lip and opening for the passage of electrons up to the edge of the metal surface of the mask.