It is a 8oz. jelly jar container, using 126 melt point paraffin wax, 1/8 vybar 260, 1oz fragrance, and zinc-core wicks. The candles in the pictures were poured at 180 for both pours. My last two candles which are not shown here, were poured at 190, so I made a 10 degree adjustment for these, but it doesn't seemed to have helped. I have been poking relief holes, but as an experiment for my last two I did not, but it did nothing to help with the sinkholes. The holes are rather large, and occur near the wick.