In this video, you will learn how to buy higher quality products with less money. The following is a comparison between 1D cylinder liners and ordinary cylinder liners: The quality of 1.1D cylinder liner is better, but the price is on the same level as ordinary cylinder liner. The 2.1D cylinder liner has exquisite workmanship, has a matte texture, is very soft to the touch, and has a better-looking color. 3. The special chrome plating process is used inside and outside, which is very textured. 4. A special process is used to maintain high corrosion resistance, and special resistors and hard resistors are used to achieve a longer life.