Hot racing blue internal spring air shock set for the rock Crawlers that use 100mm shocks features: conk aluminum shock bodies 7mm stainless steel shaft air damping internal Springs you will receive: two assembled alum shocks two hard spring silver (.7mm) two Med spring black (0.6mm) two soft spring soft (0.5mm) two 4.8 ball mount two 5.8 ball mount four 5x7mm offset spacer four 3mm countersunk wash we four 3x25mm flat head hex Screw eight 3mm O-ring requirements: installation onto the rock Crawler specifications: extended center to center: 100mm compressed center to center: 66mm overall length: 108mm diameter: 13mm SS shaft 7mm comments: best use with Asc1105 also available in green (td100t05), black (td100t01), silver (td100t08), and red (td100t02).