Yes, substitute checks are paper as well. However, they generally don’t have to be transported between banks, as is the case with the current check processing system. The current check processing system can be disrupted since it is reliant on transportation and weather conditions. Substitute checks, on the other hand, are created from digital images of the original checks. Banks can exchange these digital images electronically, reducing reliance on physical transportation. The digital images can be converted to substitute checks, if a substitute check is needed for any reason.