This is a safe helmet with the PSc mark and the S mark. It protects not only the head but also the eyes, as it has a visor. I am selling this because I bought a new helmet. It's for people with slightly larger heads. The approximate inner dimensions are 19 cm long and 15 cm wide (measured by an amateur). For motorcycles, usable. Shipped via Eco-Mercari. For people with slightly larger heads. Approximately 19 cm long, approximately 15 cm wide.