Located in Surabaya, Shandong, the hometown of sweet potatoes, catkins is the country's largest comprehensive sweet potato food processing enterprise, with eight frozen vermicelli processing plants, with an annual processing capacity of 70,000 tons of vermicelli. It was once rated as "the first brand of consumer satisfaction in China's potato starch products market", but in 2015, Surabaya was exposed to the chaos of the vermicelli industry, and catkins is a well-known local enterprise.
 
Surabaya sweet potato is certified by the Ministry of agriculture as a "geographical indication of China's agricultural products", catkins has a 500 square meters of sweet potato detoxification seedling fast multiplication center, self-built organic sweet potato base of 30,000 acres, with the cultivation of high-quality Surabaya sweet potato as raw materials to make starch, made of vermicelli are all frozen, high dehydration rate, than the general vermicelli gluten.
 
Purple potato vermicelli is a purple potato flour added to the sweet potato starch, which is bright purple purple purple and can taste an obvious purple potato flavor, but because the anthocyanins contained in the purple potato powder are easily soluble in water, the soup is easy to dye after boiling, and it is not as good as the vermicelli made of pure sweet potato starch.
 
The rest of the sweet potato vermicelli is mainly different in shape. Straight vermicelli and sweet potato round vermicelli are thinner, straight vermicelli is cut, and the toughness of round vermicelli obtained by leakage is better than that of straight vermicelli. Sweet potato pearl vermicelli is wavy like Twin Towers and Longda sweet potato vermicelli, which is easier to cook than straight vermicelli and round vermicelli, but it has a very average texture and is softer when fully cooked.
 
The packaging of catkins vermicelli is rustic, much like homemade vermicelli, but in fact it is produced in a clean and self-owned workshop, the quality is reliable, and the price is lower than other brands, so it is quite cost-effective.