Candled the initial set of 16 eggs mailed to me, not one fertile, all crystal clear..... A little peeved, contacted the seller who basically said it was due to USPS handling. Some not setting yes but all? They came from just across the border in SC and were collected from the USPS the day after they were mailed, less than 24 hrs in transit, I think the eggs were infertile from the start.