Turntable Plate Tray

What is "microwave Y107"?
I am going to buy a glass turntable replacement for my microwave on ebay and I eventually find one, but I am confused about one detail listed: "FOR MICROWAVE OVEN USE ONLY Y107". What is "Y107"?? Can anybody help me out? And here is the original website--
http://cgi.ebay.com/MICROWAVE-TURNTABLE-GLASS-PLATE-TRAY-11-3-16-DIAMETER-/250762444355?pt=LH_DefaultDomain_0&hash=item3a629b3e43
I appreciate your help!
Not sure but read following:
Garnets made from yttrium and iron (Y3Fe5O12) are used as microwave filters in microwave communications equipment.
Y107 is an isotop of yttrium.
˜ 30 ms is the half life and ˜ 107" is the atomic mass. Y for yttrium.
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