Summary: Our road has a 1-2 degree incline, so when I change the oil in our Mazda 3 I put wheel chocks under the wheels. I used 4x4's or cinder blocks before ordering them which is not the safest method. The orange wheel chocks are for a trailer/large vehicle and are too big for our Mazda 3. Recommendations: When considering wheel chocks you have two material options: 1) hard plastic or 2) rubber (or hard plastic hybrid). with rubber feet). To choose between the two you need to consider your primary storage surface, with opposite ends of the spectrum being hard and smooth concrete or soft ground. Hard plastic pads have a hard time maintaining traction on smooth concrete, so rubber is a better fit. For soft ground, a larger hard plastic with an aggressive tooth-like pattern is better suited. If you park on both hard and soft surfaces, hybrid wedges may be the best solution for your situation. Pros: good grip on hard surfaces; car size. Disadvantages: none. Conclusion: These are 5 stars and they will work well with passenger cars. With so many options at Revain, consider your storage space when deciding on a quote.