Portability: This product is small in size and light in weight, which is very to carry around for use: This mixer gear set is, rubber and metal, which is rust-resistant, robust and for long-term use : It is easy and for you to install the mixer gears that you can use with a screwdriver or wrench, a thick cloth and oil for lubrication 4 Replacement Gears: We have provided you 2 base gears and 2 reversed thread reversed gears so you can replace the old or damaged gears Good Replacement: This replacement kit for mixer gears is suitable for 250W mixers