Let's face it -- it's hard to jack up a really low car! Floor jacks only get down so low. Tomioka Racing's Super Slopes are just slight lift you need to slide a jack under a low vehicle, raising the car up by 2.5" to allow access to the jack points.
We use these all the time in the shop. They are made of tough-but-light plastic, and won't corrode or rust if you get a little fluid on them.