unlike the negative comments I've read about this article, mine is going to be very positive, because it is only necessary to read to use this adapter. It is for those who have a INDUCTION plate and do not have the proper pan (this is an aberration in my opinion) DO NOT USE IT ON !!!! VITRO NO INTEREST !!!! because in any case, better to equip vessels induction. In my case, it is just to use an Italian coffee maker induction, but too small for my background so no induction contact plates, which I bought, it is clear that heat loss is to be expected, but everything works perfectly. then remember this: to lay on adapter plate induction and use with a flat-bottomed pan, DO NOT ASK PLATE VITRO is + idiot !!!!