This is a Set of Four Aluminum Air Restrictors for Pneumatic Retracts. FEATURES: Reduces Cycle Speed of Pneumatic Retracts Giving it that "Scale Look" of Hydrolics when Rectracts Go Up or Down. The Restrictors have a Smaller Opening that causes the Retracts to Move Slower. Installs Into Standard 1/16" Air Lines. INCLUDES: Four Gold Anodized Aluminum Air Restrictors ir/jl