The coin strips are 4 inches wide and the strips are about 4 feet long. I didn't make the coins the same width, just pulled whatever size came out of the box, with half a nod to alternating light and dark colours. Super easy.
I did another Chinese Coins a few years ago and made my strips of coins in the same colour story - a strip of blues, a strip of reds and so on. Those coins were the same size.