needles is durable and also has high biocompatibility by applying gold plating. patient with metal allergy could also use it with not concerning contact dermatitis. needles is durable and also has high biocompatibility by applying gold plating. patient with metal allergy could also use it with not concerning contact dermatitis. needles is durable and also has high biocompatibility by applying gold plating. patient with metal allergy could also use it with not concerning contact dermatitis. needles is durable and also has high biocompatibility by applying gold plating. patient with metal allergy could also use it with not concerning contact dermatitis. needles is durable and also has high biocompatibility by applying gold plating. patient with metal allergy could also use it with not concerning contact dermatitis..syi