Never Compromise X Ray Sigma Mallet Putter Suspended Face Technology - Recessed cavity fitted with the SFT face insert displaces 80grams or 22% of the weight to the perimeter. This perimeter weighting moves the center of gravity lower and deeper while increasing MOI for cosistent true roll The dual density insert uses isolated ribs embedded in a softer composite which provides ultimate dampening yet a responsive feedback A gray and red alignment feature helps golfers achieve a consistent setup and improved alignment