This product has Free Shipping.

The weight is set to 0

It has the Always Free Shipping set to NO and the Free Shipping Module is installed but it will still ship for Free.

In the Configruation settings for Shipping/Packaging ... Order Free Shipping 0 Weight Status has been defined to be Free Shipping.

NOTE: if that setting is changed, then this product will NOT ship for free, even though the weight is set to 0.