Silverback Flex by Sewell is our top of the line self-crimping connector, special made for inputs that are spring-loaded or simply accept a wire only connection. The Silverback Flex pin connectors offer the beautiful and sturdy design of the original Silverback Banana plugs, but with the ability to be used with wire-type connection input. The Silverback Flex connectors use a dual screw lock for maximum strength. The gold plated flexible wire top won't fray and keeps top level signal transfer.