This is the Traxxas pair of SCT Split-Spoke Wheels. These Wheels are black and blue colored and are compatible with the Traxxas Slash (rear) and Slash 4x4 (front and rear).
Two Short Course Split Spoke Wheel
Width: 1.6" (41.5mm)
Hex size: 0.47" (12mm)
Outer Diameter: 2.2" (56mm)
Inner Diameter: 3.0" (76mm)