The BLX frames we launched back in 2012 were our first using a new racket material: basalt. This new material was used to reduce the amount of racket vibration felt at impact. BLX technology evolved into “Amplifeel” technology, which was adding the vibration-reducing effect of basalt to the racket handle. A year after the BLX Pro Staffs launched, a version with the Amplifeel handle was introduced with an almost identical design