Detailed introduction to LFR6AIX(NGK NO.)+++NGK quality++++Auto spark plug:
NGK Parts No. : LFR6AIX-11
Stock No. : 4469 / 6708 / 4105
NGK IX Iridium Spark Plugs LFR6AIX-11
Design Symbols used in NGK Spark Plugs
LF - Plug Type: Long thread reach plug Gasket type (26.55mm reach)
R - Resistor
Heat Rating Numbers : 6
A - Firing End Construction: Special Design
IX - Firing End Construction: High Performance Iridium
11 - Spark GAP: 1.1 mm (.044")
To make sure which spark plug will fit your car, please let me know your make and model and we will check it up for you / Download PDF file.
Cross Reference Denso Parts No. : IKH16
Denso IRIDIUM POWER : IKH16
Denso IRIDIUM TOUGH : VKH16
Japan Passenger cars catalogue 2012
Passenger cars catalogue 2012

NGK / Denso / Bosch / Champion / Autolite  / E3 / Beru quality spark plug

Bosch quality motorcycle spark plug

AC Delco quality spark plug

Brisk quality spark plug

Toyota / Yamaha  / Honda  spark plug

Auto / Motor  / Speeding Motorised Fishing Boating spark plug

Motor spark plug

Champion iridium quality lawn mover / Chain saw spark plug

RC aircraft F16 spark plug CM-6

Racing spark plug

OUR  SPARK PLUG

Quality & Size  :  Same as NGK / Bosch / Denso / Champion /Beru

Type : Iridium / Nomal / CNG /LPG /NGV

Certification  :  ISO/TS16949

Auto series   :  Peugeot Citroen & BMW & Honda & Toyota etc

Moto series  :  Yamaha & Honda & Suzuki etc

Garden series  :  Chain Saw & Lawn Mower & Snow blower etc

Other series  : GAS Engineee CAT etc & Model Aircraft

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Extreme ignitability 
High durability  
Consistently stable spark 
Extremely high melting point 
Outstanding acceleration
High fuel efficiency

Glossary

Iridium IX Spark Plugs are the most technologically advanced high performance plugs available. Featuring a 0.6 mm iridium center electrode tip, they offer superior ignitability without sacrificing durability. The tapered ground electrode increases flame kernel expansion, while the superior heat range design is ideally suited to the demands of high performance environments. Specially designed to meet the needs of serious enthusiasts, Iridium IX Spark Plugs offer outstanding acceleration, high fuel efficiency and long life. When you demand the most from your engine, rely on the proven performance of NGK Iridium IX Spark Plugs. 
NGK's new Iridium IX is the personification of these qualities and takes premium performance spark plugs to a new level. A level that is expected from the world leader in spark plugs. 

What is Iridium?

Iridium is a precious, silver-white metal and one of the densest materials found on earth.
The natural properties of Iridium offered NGK the opportunity to create one of the world's finest spark plugs.
The result are spark plugs that require less voltage to spark, burns fuel more efficiently, sparks at leaner air/fuel mixtures, and delivers higher horsepower and better gas mileage.

It may be time to invest in precious metal futures. NGK Iridium Spark Plugs represent the ultimate evolution of spark plug technology and performance.
Iridium allows for a center electrode 75 percent the size of a platinum electrode and 24 percent the size of a conventional nickel electrode.

The fine electrode tip is engineered for greater ignitability. And it's in the design of the iridium tip that makes Iridium IX a better spark plug.
The electrode is not too thin and not too thick. It's just the right size to reduce the voltage required for spark and to maximize the overall longer life qualities of iridium. 

For your reference, we have compiled a list of NGK standard spark plugs and its NGK Iridium IX Equilavent.
Please click the part number link to view the product details.