Standard size is 24oz cup. The "regular" we also have a small size which is in the 16oz cup.
Add just little less (-20%) milk for a thicker shake
Gourmet Milkshake includes hard ice cream.
A Malt is made the same way, however this includes 1oz -1.5 oz of malt powder. Powder is inserted in cup after the syrup before ice cream. (Small 16oz gets 1oz and Regular 24oz gets 1.5oz of malt powder)
Note location of separate "Malted" keys and prices on the cash register