The properties & features of this product may be slightly changed due to the change in moisture/weather. However, it is not fully stain-proof in low-oxygen, high-salinity, or poor air-circulation environments. This knife has a razor-sharp blade so open and uses it very carefully. We are not responsible for any injuries associated with the use of our knives. Our products are intended for legal uses only by responsible buyers. You have to be 18 or older to buy this knife. Please note that the product is sharp and harmful if you are not familiar, how technically it works. Our blades due to carbon content need to be regularly treated with wax and/or in oil to maintain its superior quality and keep it safe from rusting.