The rubber provides good grip for no slip

Good grip on hard ground; sized for a passenger car

They stay put and have superior gripping power.

Great grip, low cost far superior to the yellow plastic versions that are easily crushed

Well made, good grip and no slip.

Because it is made of solid rubber, it has really good grip of both the tire and the ground

Very sturdy and awesome grip, car did not move at all.

After all, it is Rubber!Great grip even on sloped driveway.

They have a great grip and texture.

Great product solid rubber and grips ground great when using behind car while care is on ramps in the front

I am using these on a smooth concrete garage floor and they have exceptional grip when placing the ribbed side down on the floor

The grips that are built into the bottom are also nice and provide good grip from the chocks slipping

Seem to have good grip.

These are solid rubber, with a good grip

Nice and solid with good grip

Hard rubber body creates strong grip which making accidental damage a low likelihood