These are chalks from around the 1970s (Showa 50s). This is chalk used for drawing on blackboards. A set of 6 brown chalks! The manufacturer is Nihon Hakuboku Kogyo Co., Ltd., and the product name is Tenjin Iro Hakuboku. The condition is unused, so although they are old, they can be used normally. They have been carefully stored in a warehouse since around the 1970s (Showa 50s). We are also selling other colors, so please consider purchasing them together! Due to increased shipping costs, we will be raising the price slightly. Immediate purchase is OK.