Lexan polycarbonate slats, sealed ball bearings, and a compact 11"x11" canister.
CODY Multi-Functional Growing Bed Assembly Instructions.
GatorTrax Retractable Truck Bed Cover Operations Manual
If the video shows a "Cody" brand convertible crib or desk being built:
Ultra Truck Shock, maintenance-free, direct-fit replacement.
If the video is a DIY or professional installation of a rear shock absorber for a Ford Explorer or Mercury Mountaineer: