Tactical Anglers SubDARTER SMART LURES have undergone extensive testing to ensure maximum durability and functionality.SMART LURES Critical Fish Catching Attributes:Large Recessed Diamond Eyes are lifelike and provide maximum light reflectionDurable Plastic Mold for consistency and durabilityThrough Wire for extra strengthInternal Rattling Chambers for added fish attracting noiseWeight Distribution System for distance casting and balanceVibrating Exterior System – side gills are reversed to disperse vibration