1 specialized designed, with notable decelerate effect and no noise and uncomfortable feeling 2 high intensity rubber, firm and useful, good anti-impact ability and durable 3 set up flexibly according the request of the customer, convient installation 4 black and yellow, affect in day and night, attack the attention of the drivers to decelerate successfully 5 widely used, one of the newest traffic safe productions , a good helper of the manager mainly used in the city road