This is the Traxxas pair of BF Goodrich mud-terrain tires with black/blue rims. These tires and wheels are compatible with the Traxxas Slash (rear) and the Slash 4x4 (front and rear).
Two Short Course Tire and Wheels with Foam Inserts
Hex Size: 12mm
Width: 1.7" (43mm)
Diameter: 4.3" (110mm)