These freeze dryer trays are the perfect fit for your Large Blue Alpine freeze dryer. Its stainless steel (304 SS) material makes these trays incredibly durable, being warp-resistant and long-lasting, ideal for all your freeze drying needs. With their standard baking sheet size, finding replacements is easy since almost any online or in-person retail store selling baking supplies carries them. We recommend using silicone mats as well as they will make cleaning a breeze. Optimize your freeze drying process with these trays. Stainless steel is renowned for its durability, able to withstand both high and low temperatures for years with proper use and care. That is why it is the preferred choice for freeze dryer trays.