star coasters

I am attempting to reduce the size of my star hot pads small enough that they can be used as coasters.  I want them to be about three to four inches across.  Here is my first attempt at reducing the size.  I put a measuring stick and a regular sized hot pad next to it for comparison purposes.  You can see that it looks good but I still need to reduce it a little more.

Right now its about 6 inches across.