i have flatstoppers from race ramps (2 sets). their material is werd. and it does slip if you're not careful, especially on concrete. i raise my car on jacks and place it onto the flatstoppers.
a tip is to place your ramps next to a car. you can use the car's reflection to monitor where you are on the slope. these days i just do it by feel but the first couple of times i used my other car as a mirror.
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