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1. Galvanizing of carbon steel: Trivalent chromium galvanizing is currently used; it is the most common method for treating the surface of drums and represents an environmentally friendly form of galvanizing. Plain carbon steel drums; by default, they are galvanized carbon steel drums with a coating thickness of 8–12 μm. However, the rust prevention capability of galvanizing is limited. 2. Carbon steel coated with decorative chromium: The chromium coating is usually 0.3μm thick; decorative chromium is applied using nickel or nickel-chromium processes to ensure product quality. Its surface is silver-white, with a brighter color than stainless steel pipes; it boasts strong corrosion resistance and excellent aesthetic properties, as well as a high reflectivity coefficient. 3. Carbon steel coated with hard chromium: Hard chromium, also known as wear-resistant chromium, has a chromium coating thickness of around 0.3 mm; it features high hardness, excellent wear resistance, as well as resistance to heat and corrosion. Suitable for the treatment of mechanical molds, plastic molds, corrosion-resistant valves, as well as printing and textile/paper manufacturing rollers; the surface is silver-white in color. 4. Stainless steel: Compared to carbon steel drums, stainless steel drums have greater corrosion resistance; their surfaces do not require any treatment, the production cycle is faster, they offer a high level of smoothness, and they are easy to clean. We offer two grades of stainless steel drums: stainless steel 201 and stainless steel 304. The former has slightly poorer corrosion resistance than the latter. Food and pharmaceutical products require the use of 304 stainless steel. 5. Aluminum alloy: Aluminum alloy drums have relatively low strength, but they are lightweight and have an attractive appearance; they are generally used in specific industries, such as the rubber industry. 6. Metal surface knurling: This process involves creating specific patterns on the surface of metal drums through rolling. A mesh-like texture is often applied, mainly to prevent slipping. Surface knurling is used primarily on the drums located beneath belts, and there are requirements regarding the thickness of these drums – generally, a thickness of at least 3 units is necessary to carry out this treatment. 7. PVC drum: Compared to metal drums, PVC drums can effectively protect the conveyed materials, reduce noise, and increase the friction on the drum surface. It offers a better cost-performance ratio compared to coated drums. Therefore, the turning rollers are often made of PVC to provide a cushioning effect.