Yan Fei removed the chain whip weapon and found it to be quite heavy, weighing several dozen pounds. Besides the handle, the entire length of the whip was rusted, just like the rusty gear he had encountered previously. He tried rubbing it vigorously, but the rust on the whip wouldn't come off. He gave it a strong tug and found the body of the whip to be extremely sturdy, completely unbreakable. He took a closer look at the whip and discovered that it wasn't a whip at all, but rather a chain that had been used to connect transmission devices on some product.
Despite the chain being heavy and very hard, it was surprisingly flexible and seemed soft, which is why it had been mistaken for a whip. However, with Yan Fei's expertise, he was unable to discern what material it was made of.