Tactical Anglers CrossOver Stalker 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 reflection.Durable Plastic Mold for consistency and durability.Through Wire for extra strength.Internal Rattling Chambers for added fish attracting noise.Weight Distribution System for distance casting and balance.Vibrating Exterior System – side gills are reversed to disperse vibration.