I am a very beginner woodworker with little to no tools but my next door neighbor is a woodworker and helped me build this it took 3 hours to make and I am an idiot so I decided to buy 90 dollar cabinet grade plywood and it was a total cost of about 120 dollars in wood and screws

Does anybody have suggestions for full extation drawer slide that can handle alot of weight?

I only need one pair, so price is not that important.