It seems like you're asking for a short description of a product or item, "ALPHASYN K 15, 208L 3B." Based on the name, this could be a specific type of industrial chemical, lubricant, or material. However, without further context, it's hard to be certain.
Can you provide more details, such as its category (e.g., chemical, industrial equipment) or its purpose? This will help me give a more accurate description.