Wendy,
I used my Accuquilt GO die to cut them... I used office folder - I think it was just the right thickness, but if you don't have any on hand, you can take the cards Inside the magazines.
If you don't have access to a GO cutter, you can print a template, you can follow this link:
incompetech.com/graphpaper/hexagonal/
However, I'm not sure the measurement you need to key in: is this the width, or the side, I'm not sure
Just make sure that the side is 1/2" if you want them like mine (a tad larger), or if you truely want half-size, the side should measure 3/8".
Hope that helps.
Andrée