Alpha TCF17

Topspin Cyber Flash String 17/1.25

Line: Flash

$7.49

Reference price as of June 2026 Not a live offer

Topspin Cyber Flash is one of the most playable and comfortable co-polys available. Offering exceptional spin, this lively co-poly allows big hitters to hit a very heavy ball. As with most firm monofilaments, this one offers impressive durability. Given its softer feel and high level of playability, Cyber Flash is not just for advanced string-breakers. It's also a great option for fast swinging intermediates looking to transition into a poly.

String specs

Gauge	17/1.25mm
Length	40ft/12m
Composition	Co-polyester monofilament
Color	Grey

Where to buy

Tennis Warehouse

What players say

Liked 4 sources

Reviewers and playtesters describe Topspin Cyber Flash 17 as a soft, comfortable co-poly with low raw power but strong, predictable control and above-average spin access. Testers consistently call out its value and durability compared to pricier polys like Luxilon Alu Power, though a few found its muted, dampened feel off-putting and noted the formulation has felt stiffer in some recent batches.

Best for

Fast-swinging players who want control and spin without a harsh poly feel
Intermediates moving into polyester for the first time
String-breakers wanting an affordable, durable co-poly
Net-rushers and all-courters who value touch on volleys

Pros

Soft, lively, comfortable feel for a polyester, with good touch around the net
Strong, consistent spin access that scales with faster swings
Durable and holds tension well relative to its low price
Control was rated as consistent and predictable over extended hitting

Cons

Low power rating means players need their own swing speed to generate pace
A couple of testers described the stringbed response as muted or dead, especially off-center
Some long-time users report the string feels stiffer and less powerful than older batches
Not an extreme spin string compared to shaped/textured spin-focused polys

Voices

Love the crisp, lively feel, and it's great value.

— Andy, Tennis Warehouse playtest team, Web

Control was consistent and predictable throughout the 10 or so hours I put on both sets of strings.

— Mark, Tennis Warehouse playtest team, Web

I hit well with this string, but I can't stand the response... it played powerfully, but it was very controllable.

— DireDesire, Talk Tennis forum, Forums

The faster I swung, the faster the ball would come off my strings, and also the faster the ball would spin.

— DireDesire, Talk Tennis forum, Forums

Both forehand, backhand and volleyballs can be controlled extremely well with this string.

— Simon Braunsar (ITN 5.8), tennisnet.com tester, Web

Nice string that stays in place after a hit. If you don't like pressing the strings back in place after each point, get this string!

— Verified buyer, Tennis Warehouse customer review, Web