Never Compromise Gray Matter GM2-FM Putter (Full-Mallet). Never Compromise putters in the Gray Matter 2 line feature extreme heel-toe weighting to give the putter a high moment of inertia which is what help keep the putter perfectly aligned through the whole putting stroke. The designers at Never Compromise accomplished this by removing unnecessary mass from the putter's air-crafted grade aluminium body and adding precision formed tungsten weights to its heel and toe. In order to give the golfer added control over his putts, Gray matter 2 putter also feature an aluminium-infused composite weave insert. With only half the density of standard aluminium, this high-tech insert enables Never Compromise to move more weight away from the putter's face while providing golfers with the feel they need to be confident over the ball.