The first solid core, synthetic gut string construction that features an octagonal shape with 8 sharp edges for maximum ball bite.The benefits for the all court player are greater spin and a livelier response for more feedback.TNT is for the synthetic gut player that has made a change to polyester strings, or the synthetic gut player that is considering making a change to polyester strings and shouldn\'t.TNT is the perfect string for the solid core, synthetic gut player that wants to experience the spin and control benefits that a polyester string can provide while retaining the power and feel of a solid core synthetic.