Genuine ISE Magnetic Batch-Feed Sink Plug.
PLEASE NOTE:
This is the only one for the old type ISE plastic magnetic sink plug for the modified magnetic top switch kit that clamps around the disposer neck. Will not fit the very new type batch-feed switch kit for the new  Evo 100, 200 which uses the metal "T" handle type (see below).  Not to be confused with the old type metal prong shape ISE mechanical twist type plug!