Protect-A-Boot, Plug Boot Heat Shields, Titanium, 6 inch Long, Set of 8. Titanium spark plug boot protectors are the latest in thermal protection technology. Mined from lava rock, stranded and woven into a proprietary weave, Titanium boot protectors are engineered to withstand extreme temperatures up to 1800 degrees F of direct heat. - Ultimate protection for spark plug boots & wires - Strong, durable & long lasting construction - Resistant to chemicals, abrasions & other contaminants - Universal-fitting most straight or angled spark plug boots - Cool carbon fiber look