ACT 1991 Nissan Sentra Modified Sprung Street Disc2000408 is a modified spring centered street disc featuring premium organic friction material with high copper content for better heat transfer and steel backed lining for greater burst strength and durability. These discs are modified with reduced marcel for faster shift action to complement ACT pressure plates. The heavy duty torsional dampening springs are stronger, in most cases, than standard springs and are provided in the best sizes and spring