We have our own laboratory in Kenbridge, VA where we process catalytic converters individually to measure contents. No two converters are the same, mileage on a vehicle, type, model and manufacturing year also affect the value of the contents in a converter. In addition, we send our converters for assays. Assays allow for the converters to go through a refining process in order to determine an average value. Prices are further based on these averages.