Very Rare…  Up for sale is a Benchmade Model 30 Rainbow Balisong Butterfly Knife. These were a limited run of 200 knives Benchmade did for The Edge Company 24-29 years ago. This is number 30 of 200. Weehawk blade. " The blade measures 3.1 " , handle measures 4.1 ", total length open is approx 7.25". The golden rainbow finish is spectacular. These blades are rare and don’t surface too often. Benchmade gave these blades a Ti Nitride finish which produces the rainbow colors.