It is better to use the closest possible match wherever possible to receive a close estimate of the resulting Carbon Footprint, however where no close match is available, please select “other” (if available) and an average factor will be used. You cannot change the drop-down options as the platform will not allow that data to be inputted. Please let us know if there is a material or option you would like to measure that wasn't available so that we can explore adding it in the future by emailing support@traceyour.events