Made in the USA, Pro-Tech Automotive Products specializes in professional-grade ignition wire sets and coils. Its products stand by three core values -- performance, reliability and durability. Wire sets are manufactured using high-grade materials and with the assistance of an air-soft machine that takes the human element out of the equation, limiting the risk of internal damage or spark leakage. All products stand by a 100 percent satisfaction guarantee or full replacement at no charge.