This is a Mizuno FRP (fiber-reinforced plastic) knock bat. It's 84cm long and weighs only 440g, making it very light, easy to handle, and less tiring. Also, you don't have to worry about it breaking like a wooden bat. For those looking for a unique knock bat! ● Material: Carbon + Glass ● Color: Black ● Size: 84cm, average 440g ● Knock bat (for hardball, softball, and rubber ball) I bought it last year and haven't used it much, so it's in good condition. Please purchase only if you understand that it is a used item.