... good, the endurance and wearability are extremely good, the coefficient of friction is low. Quality is light, toughness is good, ... the endurance and wearability are extremely good, the coefficient of friction is low, nonpoisonous, the surface is smooth, can ... GB16897 SAE 1394 can be worthy of the connecting type: card a set of types, bamboo joint withholdin types, and changing type quickly. ...