4" and wider thins are resawn from a board thick enough to produce 2 pieces and then planed down to a finished thickness of 1/4". This milling process releases tensions in the board and may well induce slight cupping and/or bowing in the finished piece. These movements are normal and not considered "defects". They will not be grounds for a return or refund.
These hardwood cutting packs are a wonderful product. The boards are beautiful and the quality of the cuts are superior to any I've ever seen. I will definitely be buying again! Thank you KJP!!