His ninety-one prints are extremely rare, with sixty surviving in one impression (copy) only, and none in more than five - there are a total of 124 impressions, 80 in Amsterdam. It is thought that because his prints were made using only the shallow, scratched line of drypoint, probably on tin or a pewter-type alloy, only ten to twenty impressions of each could be taken before the plate wore out. Many engravings by other artists are believed to be copies of missing works by this master. In particular, Israhel van Meckenem seems to have copied more than thirty.