Ultra Flex. I’ve never heard of this company before, but they made skateboards and Primo brand wheels. The parent company was actually Special Products, a division of something called I.I.I., located in San Diego. I couldn’t find anything definite for them via google. They must have spent some cash on this brochure though. In the 70’s you couldn’t get a 1000 full color brocures for $100. First you had to have a photo shoot in a studio. The you had to pay for professional film developing, type setting, ad layout, and mechanical color separations. Plus there was stat camera graphic work too, none of this scanning and resizing in Photoshop, and then emailing a PDF. It was all done mechanically, and this would have been expensive.
UPDATE: Added pictures of an old Ultra Flex board.