I agree with you. I have a White, Singer, Brother and it is so hard to get them right I have bought 15's and some have a slit which won't fit the White. I have read the pkg but they don't list all the machines. I even asked at Joanne's and they said they didn't have the one for the White and the repair man said yes they do they just don't know it. I bought some from him so I could take and match at the store and they do have them. It seems like I have so many bobbins with thread on them and have always got to get more at least the 15's fit my brother so all is not lost if I buy wrg or they may fit my Kenmore which isn't my fav. machine but in a pinch. Good Luck Sue