
Educational Equipment of Lever-Changing Pulley (Plug-in type I). Customizable Design: Size and color can be customized according to personalization and site needs. Solid Wood Construction: Made of solid wood with strong magnets for stable assembly and durability. Educational Focus: Specially designed for middle school physics teaching on levers and pulleys. Stable Assembly: Equipped with strong magnets at joints to prevent pulleys from falling off. Manufacturer Direct: Direct from Beijing Yanshi Zhongfa Technology Co., Ltd with OEM/ODM support. Quality Assurance: 100% visual and function inspection before delivery with strict quality control. Patented Technology: Company holds dozens of Chinese patents ensuring innovative and reliable products. Flexible Customization: Offers full customization, minor customization, and customization from samples.