CREST.01 used the new BoomCore — PureFoam surrounded by an EVA Power Ring and fused together — as its name, it is a vert powerful foam core system . Alongside a massive sweet spot, this core packs a powerful punch with unrivaled durability. No core crush, no break-in period. Explosive power without compromise.SLK is a lightweight design technology typically applied to the frame of a racket. Its advantages include:1. Lightweight: SLK technology makes the racket lighter, reducing the burden during swings and providing faster reaction time and greater flexibility.2. Improved Control: The lightweight design allows players to be more agile when hitting the ball, especially in high-speed and fast-paced matches, enabling better control of the ball's direction and power.3. Reduced Fatigue: Because the racket is lighter, the burden on the wrist and upper limbs is less during long matches, reducing fatigue and maintaining a higher level of competitive performance.