Never opened.The Bambu Lab High Temperature/Smooth PEI Engineering is a unit designed for use with A1, P1, and X1 series 3D printers. Made of Flex Plate material, this black/grey coloured unit is compatible with A1 (Not Mini) models. Developed by Bambu Lab in China, this engineering solution provides high temperature performance and smooth functionality for enhanced 3D printing results. Ideal for professionals and enthusiasts looking to upgrade their 3D printing experience, this product offers a reliable and efficient solution for achieving precise and high-quality prints.