pre-production sample refers to a prototype or sample product that is created before mass production begins. It is a trial version of the product produced to evaluate and finalize the design, quality, and functionality of the product before it goes into full-scale production.
Pre-production sample: all the details is confirmed. Before making mass production, one sample is made of materials from mass production for customer to confirm the finish and material to be right. This will be the last sample before starting mass production.