tdk ar-x

I have been using AR-X 60 and I'm very impressed. I'm glad because I sold 80 TDK MA 110 tapes for $80 and bought these 8 AR-X 60 min tapes for $80. Also, are 60 min tapes thicker than 90 min tapes ? I'm also looking forward to using at least 7/8 Super ferrics(Sony, Maxell, TDK), all weird...