Each link has a visual mesh and a collision mesh, as shown in the figures below:
<imgwidth="412"alt="visual meshes of openarm_bimanual_description urdf in rviz2"src="https://github.com/user-attachments/assets/9020efc3-69bc-420d-93a1-305885925638"/>
<imgwidth="383"alt="collision meshes of openarm_bimanual_description urdf in rviz2"src="https://github.com/user-attachments/assets/6f62184e-ccea-4859-9364-7c7d1b8def86"/>