The Turbo Power Magnesium Brush Line Set features all 4 round styling brushes - Z31, Z36, Z41 and Z50. Each brush is crafted with magnesium vertical rods that act as a heating element. The rods provide exceptional diffusion of heat. The wide vents channel the flow of hot air to dry and straighten hair evenly and quickly. Heat and chemical resistant. Each brush size can create curl by rotating through the hair. The 4 sizes allow you to create different sizes of curl and extra volume in the hair.