This is the optional Golden Horizons Aluminum JR Servo Horn. FEATURES: Aluminum construction Anodized black in color Fits JR servos INCLUDES: One Aluminum JR Servo Horn REQUIRES: Installation on the servo SPECS: Overall Length: 29mm (1.1") Width: 10mm (0.39") Height: 2.5mm (0.10") COMMENTS: Also available in: Orange (GHHM1072) Purple (GHHM1073) Blue (GHHM1071) Red (GHHM1090) Golden HorizonsPart GHH01089