New Upgrade Removal Spring Double Side Steel Sheet Pre-Applied PEI+Magnetic Base 235/310/355mm MK32 For 3D Printer Hot Bed THICK PEI: Our PEI is much thicker than our competitors at 0.3mm thick, ensuring tear-out will not be a problem! Advtanges: Never warp& Never rust. Easy to get the first layer even for a new user Flexible, Removable, stick to magnets very well Suits variety of filaments, especially for PLA and ABS Free clean- just flex the plate a little then take the prints off after cooled Fast heater performance, less waiting time after printing. A lifetime 3D printer bed