These are optional Team Integy Billet Machined Piggyback Shocks for the Traxxas 1/16 E-Revo and Slash. FEATURES: Billet machined aluminum construction Anodized blue in color Fully assembled Piggyback oil reservoir INCLUDES: Four Assembled Shocks w/Piggyback Reservoirs Mounting hardware REQUIRES: Installation into Vehicle and shock oil COMMENTS: Also available in Silver (INTC3933) IntegyPart INTT3460BL