Carbon Shell Grip Full Caron Monocoque Spiral X Core + Hi-Power X CI4+ Reel Seat The pinnacle of the Poison series, the Poison Ultima brings Shimano's JDM offering to the North American market and generously showcases Shimano's most advanced rod technologies. Shimano's flagship Spiral X Core technology blends lightness and increased multi-directional strength while combining with Hi-Power X technology for added blank twist resistance. High-performance and lightweight Shimano X-Guides draw out the full potential of Poison Ultima's rod design for trouble-free and heightened casting performance. Casting models feature Shimano's Full Carbon Monocoque grip that leverages a full-carbon design while delivering extreme sensitivity and showcasing a new handle shape developed by scientifically analyzing tournament anglers' movement and holding posture to elevate performance. Spinning models feature a Carbon Shell Grip — a lightweight, hollow structure — that enables anglers to determine even the slightest differences underwater as it transmits vibration through the hand. Built to be the pinnacle of performance, the evolution doesn't stop for Poison Ultima.