These are TPU fount bumpers specifically designed and sized to fit Coleman 321, 325, 335, 286, 288 lanterns and 508, 533 stoves.  They might fit other models but these are the models I have on hand that I have been able to confirm fitment on.  Made from 3D printed TPU so they are tough and durable but still just flexible enough to easily install and remove.  Currently available in black and natural.  Protect the bottom of your fount from chips and scratches and also helps give better "grip" on smoother surfaces to help keep the lantern or stove from sliding.  Does a great job keeping dirt out of the bottom lip on the fount to help prevent future rusting.