Prince thunder extreme 100 tennis racket the prince thunder extreme 100 tennis racket is head light balanced to provide extra manoeuvrability and has a head size of 100in2 645cm2 the extreme string pattern ensures 30 more spin whereas the morph beam construction guarantees added stability and power in addition the triple threat technology delivers more power and control tennis racket head size 100in2 645cm2 frame weight 275g 97oz balance 330mm head light b