Hey, I'm Steve Smith with Camper Van Freedom. I bought these Bates paint tray liners on Amazon and used them while rolling bedliner. They were inexpensive, worked well and were good value. They are a simple part of the setup, but it helps to distinguish the liner from the tray and roller around it. The Bates product is a molded plastic liner for a nine-inch paint-tray format. The recessed part holds the coating, and the sloped part gives the roller a loading surface. The liner sits inside the supporting tray; it is the removable insert rather than the complete roller application kit. Loading the roller and applying the coating are different stages. The tray provides the loading area, while the roller cover contacts the surface and contributes to the finish. A tray liner and a textured roller cover therefore have different jobs in the same coating setup. My van's exterior coating project involved masking and preparation as well as choosing application tools. I used these Bates liners during the rolling work. My review of them is straightforward: they did their job well for an inexpensive purchase. The first comparison on my page is a Bates package that supplies a tray and liners together. The other is the Custom Coat bedliner roller kit I also used, which groups rollers, a tray and brushes. A liner-only pack, a tray package and a complete application kit are different shopping formats. I would start with the pieces already in my setup and the matching tray format. Thanks for watching. I'm Steve Smith with Camper Van Freedom. Read the full Bates tray-liner review for the matching product, my build context and those two buying formats. The separate roller review explains my experience with the covers themselves. See you on the next project.