Sour decks have a couple of concaves so you have to watch out. You must check the model in their page or some other online store like skatedeluxe.com and see what concave it has, coz they have high, medium and low and also different variantions of the lengths, but most of them are around 31.75 - 32 with 14.2 wb. The low/mellow concave actually is not flat at all. it is similar to baker mellow concave decks, which in my opinion are close to medium. I bought 8" sour deck that was listed (and also lazer engraved on the top) as 31.28 long and it happened to be 31.88 haha but other than thaat i like it - the wood is ok, the shape is great, kind of tapered kicks and nice mellow-medium concave.