Cleveland Bloom CG14 Wedge The grooves are milled to maximum conforming dimensions using a proprietary CNC mill bit to create envelop-stretching geometry Gelback Technology - Cleveland Golf's lightweigh visco-elastic and It is vibration-tuned to remove unwanted vibration on miss-hits To improve shot consistency, the new groove geometry was coupled with an innovative plating process It has vibration dampening material, is placed directly behind the hitting area of the clubface in the back cavity