Quad plates designed for artistic skating vary in design based on the discipline they are created for. Professional and mid-level plates are made of a strong lightweight metal like aluminum, stainless steel, or titanium. Entry-level plates can be made of nylon or other plastics. Freestyle and creative solo plates will have toe stops at the front to execute jumps (used in the take-off of jumps such as the toe loop or the flip), spins, and footwork. For compulsory dance and figures where toe stops are unnecessary and may impair the skater's mobility, plates will often have no receptacle for a toe stop; the skater may also choose to remove the existing toe stops from their plate and replace it with a jam plug or mini stopper. For loop figures, skaters will often mount a shorter plate to their boot for maximum maneuverability. Some dance plates have a lower center of gravity for extra stability. Popular quad plate brands include Roll-line, RollerSkates Italia, Atlas, and Snyder.