Collision integrals are tabulated for the spherical shell potential over a range of reduced temperatures from 0.2 to 10.0, for a range of core sizes from 1.20 to 4.0 The results are compared with those obtained for other bireciprocal potential models and the Kihara core model. Potential parameters are deduced from gas viscosity data and compared with those obtained from second virial data alone. The viscosities agree for most models over a rather wide temperature range; however, the thermal-diffusion factors show marked differences especially at low and at high temperatures.