Yes, indeed. There are some tricycles that come with metal parts and these may be harmful when put to the wrong use. You should take a step in this regard and get your kid a tricycle made of plastic so that your kid doesn't get injured while having fun. Metal parts are also affected by changes in the weather, so these are not ideal options for kids. There are certain tricycle manufacturing companies that make tricycles that have blunt ends and harmless parts, so doing a good amount of research before getting a tricycle can help. It's good that you're thinking about the safety of your child in this manner, good question!