Little is known about DOR MEI, They were a company based in Hong Kong that produced toy dinosaurs, dragons and monster creatures. They operated mainly during the 1970's and 1980's years. From the year 1986 to the year 1989, many of their figures were released under both names "Dor Mei" and "UKRD", before the name "Dor Mei" disappeared completely in the profit of "UKRD".
This line contains relatively large figures, larger than the average vinyl dinosaur toy we can find on the market. For example, the Brontosaurus measures no less than 15" long and the Tyrannosaurus measures 11" tall. The Styracosaurus measures 13,5" long. So, those dinosaur toys are rather huge.