Product review (1 stars): The return process with Amazon was very easy, so far
The item appears to be rubber.  It is very flimsy with a hollowed out core. The gasket was simple to installed, but collapsed upon itself completely in several areas during the first wash cycle. I speculate this is due to either the item being defective or it being flimsy with a hollowed out core. I will find out when my replacement arrives. The return process with Amazon was very easy, so far.