This caster uses advanced gravity sensing technology. When the user sits down, the wheel will automatically lock instantly, effectively preventing the chair from sliding and shifting. When the user stands up and leaves the seat, the wheel will automatically unlock and can rotate flexibly. It greatly improves the convenience and safety of children's chairs and children's beds. The main material combination of PP+PVC gives the wheel excellent stability and impact resistance, ensuring that it is not easy to deform and damage when subjected to a certain weight and external force. The PU wheel surface has excellent wear resistance, effectively reduces rolling noise, and protects the ground from scratches while creating a quiet and comfortable use environment. The small socket structure is exquisitely designed, easy to install, and saves space. It is a good choice for your mobile equipment.