The Ronin Gear Trainer butterfly knife features smooth action, a dull edge so you won't cut yourself while practicing new tricks and is amazingly durable. This trainer balisong has a blade that cannot be sharpened. It has olive finished handles, and a stainless steel blade (dull). We took one of these and beat it against some steel pipes in an effort to see how strong they were--these are durable. It is built with pin construction and should give you hours of great practice. Overall: 9" Closed: 4 3/4"