Our crates are crafted from a natural product, and as such, there can be some variation in the wood pieces. We strive to ensure that approximately 80% of the wood in our crates falls within our specifications standards, However, it's important to note that the remaining 20% allows for some carisation where certain pieces may be slightly thinner or thicker than the specs. We understand your concern about the tinner, smaller pieces potentially burning top quickly. Your input helps us continuously improve our products and service to better meet your needs.