Package content: you will receive 4 retractable balls with ropes, 4 adjustable clips, and 4 hooks. This set provides practical parking guidance for various vehicles and is sufficient for your needs. Adjustable length: each garage ball measures approximately 2.5 inches in diameter and comes with a rope that is approximately 13 meters long, featuring adjustable buckles to fit different vehicle types. The parking sensor balls are bright yellow, making them highly visible and easy to see for a convenient parking experience. Easy to install: attach the hook to the ceiling or wall, use the clip to adjust the rope to the desired height. Once installed, the ball will indicate the proper parking position, helping you park accurately and avoid overextending into the garage space. Safe material: made of rubber and felt, these parking assist balls are soft and will not scratch windows or damage your vehicle. They provide a safe and effective way to determine the correct parking distance. Practical parking indicator: helps you park quickly and accurately, reducing parking stress and protecting your vehicle from accidental bumps.