The Thruster Fierce is a head-heavy power racket built for attacking players who finish rallies from the back of the court. It pairs a stiff 6.8mm shaft with a Power Box frame and a Free Core handle, so you get a stable, controlled smash and a tension ceiling of up to 35 lb on the 4U. This is a step up from entry-level power rackets: the stiff shaft calls for a developed swing and delivers a flat, precise, hard-hitting response, which is why it suits intermediate to advanced attackers rather than beginners. Few sites naming this as Fierce SI X and increasing the MRP to 16k+

What the technology does

• Stiff 6.8mm shaft: the firm, sturdy shaft transfers your swing into the shuttle with little lag, for a flat and accurate hit. It needs a reasonably fast swing to release that power. The 6.8mm profile is on the thicker, durable side rather than an ultra-slim performance shaft.
• Power Box frame: the box-shaped cross-section resists twisting on off-centre hits and lets the frame hold high string tension without distorting, which keeps the string bed stable on a hard smash.
• Fibre Reinforced System (FRS): added frame reinforcement so the racket withstands high tension and remains durable.
• Free Core handle: an injection-moulded handle that lets the shaft move more freely from the grip, which smooths the swing and improves comfort and feel.
• Nano-resin frame filling: resin worked into the carbon layup fills micro-gaps for added stiffness and less frame deformation.

How it plays

Balance is head-heavy, so weight sits up in the head and loads the smash for steep, penetrating shots from the rear court. The stiff shaft is the defining trait: it rewards a full, committed swing with a flat, controlled, powerful response, and it gives little back if your swing is slow or late. Combined with the head weight, that makes the Fierce a focused attacking tool rather than an all-rounder. The Power Box frame keeps the head stable through contact, the Free Core handle keeps the swing comfortable, and the 6.8mm shaft adds durability for regular hard hitting. As with any stiff, head-heavy frame, it is slower at the net and in fast defensive exchanges than a lighter, even-balance racket, and it asks more of your technique.

The 35 lb tension ceiling

The 4U Fierce strings up to 35 lb. Indian club and tournament players increasingly string at 28 to 30 lb for a crisper, more controlled bed, and the Power Box frame with FRS reinforcement gives the headroom to go higher without the frame distorting. A higher tension on this stiff frame sharpens control and flattens the trajectory, which suits the attacking brief.

Who it suits

• Intermediate to advanced attackers who generate their own racket-head speed.
• Singles and rear-court doubles players who finish rallies with the smash.
• Players who string at 28 lb or higher and want headroom to 35 lb.
• Anyone who wants a durable stiff-shaft power racket without moving to a flagship price.

Who should skip it

• Beginners and players with a slow or developing swing. A stiff, head-heavy frame needs racket-head speed to release its power and will feel dead and demanding without it. A lighter, more flexible racket is a better starting point.
• Doubles players who need quick hands and fast defence. The head weight slows you down in the flat exchange.
• Control and speed players who want a light head and an ultra-slim shaft. This is a durable 6.8mm power frame, not a speed racket.

Specifications (4U)