Isospeed Professional Classic

Name: Isospeed Professional Classic
Brand: Isospeed

Polyester · 1.20 mm/1.25 mm · Soft · 20–25 kg

Co-polyester · 1.20 mm / 1.25 mm · round · soft

Analyse this against my profile

No verified live priceSource: Isospeed (official string page)

Who it is for

intermediate, advanced players who want arm concerns.

Why it works

Co-polyester in a round profile at 1.20 mm or 1.25 mm gives this string its soft character. The brand positions it as a softer, more forgiving option.

Watch-outs

Numeric feel ratings on this page are editorial, not manufacturer measurements. Firm full polyester is not a safe default for players under 13, for smaller juniors or for anyone with elbow, wrist or shoulder trouble — a multifilament, synthetic gut or a professionally chosen hybrid is the safer starting point.

Strengths

Softer construction is kinder on the arm
Sold in 2 gauges — thinner bites more, thicker lasts longer

Trade-offs

Polyester loses tension well before it breaks — restring on a schedule, not on breakage
Feel ratings here are editorial; the only real test is a session on your own frame

Compatible player profiles

Intermediate swing speeds
Advanced swing speeds
Players protecting an arm
Control-first hitters

Specifications

Exact where published; “not verified” where not. Reviewed 2026-09.

Type: Polyester
Material: Co-polyester
Gauges: 1.20 mm · 1.25 mm
Shape: Round
Stiffness class: Soft
Arm-friendly: Yes
Typical tension window: 20–25 kg
Intended level: Intermediate · Advanced
Good pairings: Arm concerns · Stiff frames

Editorial ratings

1–10, derived from published specs and category norms — not user reviews.

Power7/10
Control8/10
Spin6/10
Comfort9/10
Durability6/10
Tension maintenance7/10

Where this data comes from

Verified facts: Length, size, published weights, materials and other specs shown as exact values are taken from the linked page. Anything the brand does not publish is shown as “not verified”, never estimated.
Editorial assessment: The 1–10 ratings, “who it is for”, “why it works” and “watch-outs” are our own reading of the published specs and category norms. They are not manufacturer claims, user reviews or test-lab measurements.
Source: Isospeed (official string page)
Reviewed: 2026-09 · Current — listed in the brand's current range at the last review
Not verified for this variant (0): Every field we track is published for this exact variant.

No live price or stock is shown anywhere on this site. Verify specs and availability on the official page, and demo before buying where you can.

Copies a prefilled report including the product ID (stb-isospeed-professional) and the field you want to correct.

Curated sample database

Specs last reviewed against the linked manufacturer page in September 2026. Verify before buying — models, specs and prices change.

Facts marked not verified were not published on the linked page and are never guessed. We do not show reviews, ratings from retailers, stock or discounts, and a retail endorsement model is not a professional's match frame.