Features: Double-sided Build Platform: Including textured side and smooth side. PEI film, amber color, smooth surface, good adhesion to various printing materials, especially PLA and ABS, platform temperature can heat up to 80. 310*310mm PEI platform size, compatible with engraver model such as Kobra Plus / BLU-5 / SP-5 / Ender 3 S1 Plus / SV04 IDEXetc.; And suitable for 300x300mm printing size laser engraver. Second layer is spring steel plate, which is specially used for making springs and elastic elements. With elastic deformation ability, it is difficult to permanently deform it by manpower. With magnetic base, made of soft magnetic rubber, is soft in texture and has good magnetic and temperature resistance. With back glue, it can be directly attached to the hot bed platform. Material compatibility range is wide, such as PLA, ABS, PETG, TPU, ASA, etc. Specification: Size:310*310mm/12.2x12.2in Material: Spring steel sheet + PEI sheet + magnetic rubber plate Package Size: 220*220mm: 24.2 x 24.2 x 2.5cm / 9.5 x 9.5 x 1.0in 235*235mm: 25 x 25 x 4cm / 9.8 x 9.8 x 1.6in 310*310mm: 37 x 36 x 3.5cm / 14.6 x 14.2 x 1.4in Package Weight: 220*220mm: 400g / 14.1oz 235*235mm: 460g / 16.2oz 310*310mm:1085g/2.3lb Packing List: 1 x PEI Spring Steel 1 x Magnetic Sticker