According to my experience, these springs from the Industrial and Scientific category are a great addition to my Creality 3D printer. They are easy to install and have improved the print bed leveling process significantly. The springs have a sturdy build and provide the perfect amount of compression for consistent printing. The only con is that they are slightly pricier compared to OTHER options in the market .Overall, I highly recommend ExcelFu compression springs for any 3D printing enthusiasts looking for reliable and durable springs..