Creating a cylindrical da Vinci bridge, dispersion of force, science experiment, bridge made without glue, wooden teaching aids
<img src='https://view01.wemep.co.kr/wmp-product/3/307/1795083073/pd_fxesgows1rtf.jpg'><br><img src='https://view01.wemep.co.kr/wmp-product/3/307/1795083073/pd_qnntjvhlj72i.jpg'><br><img src='https://view01.wemep.co.kr/wmp-product/3/307/1795083073/pd_kz151hjn6mnm.jpg'><br><img src='https://view01.wemep.co.kr/wmp-product/3/307/1795083073/pd_rpm9pj1drkwl.jpg'>