16 inch Strand. The large Coin shaped beads measure approximately 25mm and the small round separator beads measure 4mm. There are 14 coins and 15 round 4mm beads per strand. These beads are AMAZING! I am generally referring to them as GREEN JASPER because there doesn't seem to be a consensus on the official name. I've seen them referred to as Green Lace Jasper and African Rhyolite, among others. In the Shop, we are fondly referring to them as "Google Earth" Jasper. If you've ever looked at the terrain view on Google Earth, you get the idea of the beautiful patterns. The patterns can be best seen in the photo of the large coins that I have listed.