The Extension AC is a markedly thin 7 ply blade (inner ply 2.5mm, total thickness about 4.7mm). A softer ply combined with a medium hard ayous inner ply creates extremely good control. Carbon fiber plies ensure stability and a larger sweet-spot. The robust Akacie outer plies produce great rebound. This blade is for players that want to have the qualities of a carbon blade with the best possible control.