It's very like a normal seal but with an insert a la panel van conversion seals. You can get chrome effect inserts that I more or less destroyed the "chrome" while fitting, or plain black. Both expand the seal after you have it fitted so the initial fitting isn't so tight. OR you can get proper deluxe with an aluminium insert but the insert doesn't expand the rubber, has to be fitted before fitting the window and seal into the van and I think would be more difficult than a plain seal to fit, particularly while not denting the flimsy aluminium deluxe insert. For mine I'd be going for the black plastic insert type - black to match the other seals.