Quote from "Aston Martin Quarterly"
magazine:
"The ultimate cable for spark efficiency in the Aston range is specially
designed for racing and extreme conditions, operating from -60 dgrs
to +400 dgrs C and capable of carrying up to 90,000 volts. This is
a larger 10 mm diameter blue extreme silicone sheath cable with stainless
steel resistance wire coil wound (70 turns per cm) around each of
four individual ferroflex cores."
A typical energy drop in this instance from coil to plug on longest
run cable, is an amazing 1-2% compared to the V8 standard cable
at 15-18%. The cable will fit all existing distributor caps but
requires modified HT clips and brackets."
Not just Aston Martin, these cables are made to fit 95% of cars
on the market.