Mill sawn at 4.1/8 thickness and sanded on both sides. One side to 80 grit sandpaper and the other to 36 grit sandpaper. 20 year old cedar slab. I've built tables from this tree and there beautiful. High 4.1/8 inches thick.The moisture reads 11.1. This is a raw material untreated. We thank you for your business. This item is made of cedar.