excel drop down boxes to combo boxes with size adjustable font

i currently input data into an excel spread sheet using drop down boxes. the font on the drop downs is very small. I need to make it bigger. You may have another method of doing this......ive read that it can be done by converting the boxes into combo boxes. I have approximately 15 to convert....i can supply the worksheet i use for input. I will need to copy and past some of the boxes throughouit the work sheet...(refernces etc will not change)