优质铝合金材质,可方便调节滚筒的扭力,具有独特的自锁装,收卷画面空间大,更适用长、厚材质画面展示。 It is made of high quality aluminium alloy section, convenient on adjusting torque of roller, equipped with unique self-locking device, large rolling picture, suitable for long and thick fabric picture.