this is a replacement corner bed bumper. the piece has been made deeper to hold a 1/4" thick mic6 aluminum plate for the bed material. this will hold the plate without the need for the clips anymore. for those of you still using glass these can still be used. all you need to do is just scale it in the z axis to thin it down a little or you can leave them deep as they are. i found that after a year of heat the stock makergear rubber got hard and was cracking. i printed mine in ecoflex pla but im sure ninjaflex or other flexible filament would work as well as abs.