Prince thunder strike 100 tennis racket the prince thunder strike 100 tennis racket has a 100in2 head and incorporates the triple threat technology ensuring added power and control an open string pattern 16x19 guarantees more spin and an amazing feel while the morph beam construction results in maximum stability it has a head light balance for excellent manoeuvrability and offers the sweet spot expansion at 3 6 9 and 12 oclock for an increase in sweet spot the racket is constructed of