Victor,

The $7.00 Strikes are the size of the inside of the $10 Strikes. The $7.00 came out a year before the $10.00s. The $7.00 is also the same size as the $2.00s. Naturelly the holder is smaller. The $20 & $40s are larger ,But will fit either one. There are some $40s,that are the same as the $10 Size,but are few. You can purchase a holder which can be used with all (3) $10s Through $40s. It has a ring inside that takes up the slack inside of the holder. They are also airtight.