Yes, these are erasers. As you can see some look like canned and bottled drinks and some look like cups of noodles. There is a plate of food and a yellow obentou or lunchbox full of food (rice with a dried plum, fried shrimp, lettuce, and hamburger.) There is an ice cream bar on a stick, a pink peach and a red pepper. There is a tea pot, tea cup, a carton of milk and a carton of coffee milk. And a panda. There is also a paper box with an eraser that looks like chewing gum. These are just some of the different kinds of erasers that are sold here. It is okay to take these kinds of erasers to Little Brother's school.
This is a basic eraser. These are commonly used at Little Brother's school. Note the cardboard cover. When the eraser is worn down, it can be pushed through the cardboard.
Pencils do not have erasers on them here. I wondered why and then noticed all my American pencils' erasers had gotten hard. They couldn't erase anymore. I think maybe it is too humid here for them.