made of plastic, velcro and foam and costs $10 to make. and when they presented it -- >> the judges were stunned. they didn't know what to do with them. >> reporter: well, they did, actually. the judges gave them the global innovation award which comes with $20,000 to help pay for patenting what the girls call the bob 1 and the slightly improved version, the bob 1.2. >> i never thought i'd have a patent. when i first found out i didn't know what the word meant. >> reporter: and indeed with some ceremony they got the patent process started here in washington. which was good. they met danielle for the first time and saw her draw. all dh9-m"u they came up with, one day up in a tree. john donvan, abc news, washington. isn't that great? smart group of girls. very smart. >> absolutely. >> good for them. >> the project, took the girls, 180 hours of work. and the research between spring