[Retractable tow strap]: With this strap, you can pull your child on their own bike while steering and balancing themselves. The strap is flexible and can be retracted or extended while driving, so you can easily ride over bumps or puddles.[SAFE AND CONVENIENT]: This bike tow strap has a solid round rubber band end with a double hook that attaches behind the seat post and under the seat, providing a durable and convenient way to use it.[EASY PULLING]: With this bike tow strap, you can pull your children to the top of the hill with a few pipes and ropes, providing an easy towing solution for parent-child rides.[Relaxing and Stable Towing]: This bike tow strap keeps the distance between two bikes to a maximum of 2.50m, ensuring a relaxed and stable traction. Once the elastic band is stretched, you and your children can enjoy a comfortable towing experience.[Lightweight and practical]: the bike tow strap is so practical and lightweight that you can take it with you comfortably. It can be put in a large bag or backpack and has a light weight of only 280 grams. Size: 15 x 10 x 7 cm."