Tiburon Engineering offers several sizes of frames to retrofit early edition Penn International reels. Prior to the introduction of one-piece frames by Penn, all of the International reels were constructed with multi-piece frames. In big game reels like Penn Internationals, the strength and rigidity of one-piece technology is a must-have for the serious angler.ology is a must-have for the serious angler. All frame kits include a machined aluminum reel clamp and the stainless steel studs and nuts needed to install it. Tiburon International series frames are Type II anodized gold.