Featuring a slightly larger shape and a fixed weight in the back of the sole, the OPTM Hybrid blends speed and stability with a high launch, giving you the confidence to attack longer approach shots from any lie and in any conditions. MOI, or "moment of inertia", is the term the golf industry uses to measure a club's stability and forgiveness. When a mishit occurs, the club head rotates around the ball, causing the face to twist open and push a shot offline. The higher the MOI, the more stable the club is, and the more resistant it is to twisting at impact. Cobra's OPTM family of metalwoods and hybrids is the first to optimize the club head for POI, or "product of inertia." While MOI measures stability in both horizontal and vertical directions, POI measures stability diagonally. By optimizing both MOI and POI using advanced supercomputing to strategically position weight in the head, OPTM delivers dramatically increased stability and forgiveness. Cobra's testing supports that claim, with OPTM producing significantly tighter dispersions, meaning longer and straighter mishits. COBRA OPTM Hybrids Feature: Traditional profile, slightly larger volume, high launch, mid spin A.I. optimized for MOI and POI for maximum stability and forgiveness, resulting in reduced side spin, a tighter dispersion, and increased accuracy Fixed rear sole weight positions the CG low and back to maximize MOI and produce a higher launch and a steeper landing into the green FutureFit33 hosel system offers 33 unique loft and lie settings for more fine-tuned customization options (loft and lie can be adjusted +/- 2� independently; SMARTPAD keeps the face angle square in every setting) Stock Shaft: KBS PGH (Players Graphite Hybrid) 85 Stock Grip: SuperStroke Crossline Black (Standard Size, 60R) Headcover Included Authorized COBRA Retailer Specifications Club Loft Loft Range Lie Lie Range Length Volume Availability 3 18� 16� - 20� 58� 56� - 60� 40.88" 124cc RH/LH 4 21� 19� - 23� 58.5� 56.