Φ3mm-63mm PTFE Ball Sphere Precision Solid Plastic Balls White Valve Seal Balls | eBay
2 x 60mm Polished Clear Plastic Sphere Transparent Acrylic Solid Spheres Balls + Storage Pouch : Amazon.co.uk: Home & Kitchen
Consider a solid plastic sphere of a radius a containing a uniform charge density \rho. Concentrically surrounding this charged sphere is a hollow conducting spherical shell of inner radius b and oute
Molded Solid POM Derlin Plastic Sphere / Ball with Hole - China Rubber Sphere, Solid Ball | Made-in-China.com