TableTennisDNA

Double Fish · No family · Inverted

Qi Ji

Qi Ji is one canonical identity; Qi-Ji, Qiji and QiJi are spelling variants of the same rubber. The romanised spelling differences never create a second record.

Approval listed onlyGrippy to mildly tackyListed in the Double Fish approval inventoryMarket status unknownMade in China

Also listed as: Qi-Ji · Qiji · QiJi · Double Fish Qi Ji

Specifications and evidence

CategoryInverted
SurfaceGrippy to mildly tacky
SpongeDouble Fish sponge
Sponge hardnessMedium (TTDNA band)
Hardness scaleNo published manufacturer scale
ThicknessStandard sheet range
Rubber coloursBlack · Red
Country of manufactureChina
Approval nameQi Ji
Approval ID23-017
Approval coloursNot recorded
Approval statusListed in the Double Fish approval inventory
Approval verifiedCurrent list
Market statusMarket status unknown
Market status verifiedCurrent
Market sourceNo verified current source
List priceVaries by retailer

Approval evidence and market availability are recorded separately. A name listed by an approval source is not proof that the rubber is currently on sale, and a rubber on sale is not proof of a current approval. Approval is never inherited by a suffix or edition, and no expiry date is invented.

Market status describes current commercial availability only. Where it could not be verified it stays unknown rather than being guessed from a shop listing.

Printed hardness values are manufacturer figures on the maker's own scale. A printed Chinese degree is not assumed to equal an ESN degree, and no hardness is inferred from a product code or a sponge colour.

No reliable official Double Fish list price is published per region, so no price is shown rather than an invented one.

TTDNA core profile

Speed
79
Spin
88
Control
82
Arc
57
Hardness
52
Tackiness
6
Block
71
Durability
74
Throw angleMedium
Play stylesTopspin attack · Active spin play
Recommended sideForehand · Backhand
Speed classOFF- · OFF
LevelIntermediate · Advanced

TTDNA values are TTDNA's own editorial 0–100 ratings. They are not official Double Fish measurements, not laboratory data and not a conversion of any retailer score.

TTDNA ratings

Speed79
Spin88
Control82
Power78
Grip85
Tackiness76
Arc57
Catapult50
Throw angle60
Elastic64
Spin sensitivity86
Short game64
Blocking66
Backhand flip79
Counterloop83
Opening loop79
Chop58
Serve85
Service receive74
Difficulty62
Beginner friendly47
Durability70

TTDNA values are TTDNA's own editorial 0–100 ratings. They are not official Double Fish measurements, not laboratory data and not a conversion of any retailer score.

Data confidence

Verification tierApproval listed only
Specification confidenceMedium
Editorial confidenceMedium
Unresolved fieldscurrent commercial variants · verified thicknesses · verified sponge hardness · current approved colours · current market status
Source prioritycurrent_official_double_fish_product_page_or_catalogue → current_official_double_fish_technical_sheet → current_authorised_double_fish_distributor → latest_currently_valid_ittf_racket_covering_list → official_product_packaging → established_specialist_retailer → archived_official_or_distributor_page → independent_specialist_test → multi_source_review_consensus → community_discussion → marketplace_listing
Last checked3 August 2026

Variants and configurations

1 variant

Colour, thickness and configuration are variants of one model — never separate products. Colour never changes a rating, MAX and OX stay qualitative labels, and OX carries no sponge hardness.

Black · Red · Standard sheet range

Standard · Sponged · Medium (TTDNA band)

Speed 79 · Spin 88 · Control 82

Known users

Offensive club and league players who want a spin-first inverted sheet on the forehand or backhand.

Double Fish publishes no athlete roster for this sheet, so TTDNA shows the player profile it is built for instead of invented names.

20 Double Fish models in TTDNA · Compare the range