Please see listing photos for comparison of Ruthenium HX spark plugs vs existing technologies.
 
"NGK Spark Plugs is introducing the latest technology in high ignitability spark plugs to the automotive aftermarket: NGK Ruthenium HX™ .
 
Ruthenium HX™ spark plugs. The ultimate high ignitability spark plugs from NGK. Modern engines demand spark plugs that provide top performance while enduring the most severe conditions.
 
NGK Ruthenium technology provides maximum durability and performance in newer engines where greater ignition efficiency is demanded. Modern engine designs utilize advanced technologies to create more power with less fuel. This results in greater heat and pressure in the combustion chamber, which shortens the life the spark plug. In response, NGK created Ruthenium HX™, a high ignitability spark plug with outstanding service life.
 
Patented high ignitability DFE and PSPE tip designs provide the most efficient and complete fuel burn of any aftermarket plug, resulting in quicker throttle response, smoother idle and better cold starts.
 
NGK's Ruthenium alloy technology provides superior oxidation resistance, delivering unparalleled durability and outstanding service life.

Ruthenium HX Spark Plugs
 
Patented OEM designs meet the demands of modern high heat engines.Ruthenium HX™ contains all the features that enthusiasts expect from NGK spark plugs, including a high grade alumina silicate ceramic, trivalent plated, cold rolled threads, and the highest quality manufacturing and testing."

Compatible with the following part

AUDI/SKODA/VW
06H905601A06H90561106H905621101000063AC101905611101905621101905621C101905631B101905631G101905631H101905640D

BMW
12120035747

Bosch
FR7KII332SFR5KPP332SFR5DPP222FR6DPP332

Denso
K22PR-U (3165)PK22PR8 (3273)IK22 (5310)IK22G (5348)PK20TT (4504)K20PBR-S10 (5061)IK20 (5304)IK20TT (4702)
 
GM
12681656
55576026
55585517
 
Honda
98079571BH98079571BV98079571CH98079571CV980795787T98079578BU
 
NGK Laser Iridium
IZFR6K-11 (6994)IFR7G-11KS (7746)IFR7X7G (91039)
 
NGK Iridium IX
BKR7EIX (2667)BKR7EIX-11 (6988)ZFR6AIX-11S (97138)
 
NGK G-Power Platinum
ZFR6BGPS (92213)NGK Laser/Double PlatinumPFR7S8EG (1675)PFR7B (4853)PFR7G-11S (7772)PFR7Q (7963)
 
NGK StandardBKR7E (4644)