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19mm-1000mm 304 Stainless Steel Hemisphere Half Steel Hollow Spheres Half Metal Balls Mirror Polished
size ranges is from 16mm to 5000mm
2)Aluminum hemispehre
size ranges from 45mm to 500mm
3)Mild iron steel hemisphere
size ranges from 19mm to 3000mm
4) hollow brass sphere
size ranges is from 20mm to 500mm
5) copper hemisphere
size ranges is from 20mm to 300mm
Thickness is with half sphere diameter,thinner wall for small hollow half sphere,thicker wall for bigger hollow half sphere,meanwhile the thicker wall,the more expensive price of hollow half sphere.
To choose the best suitable wall to the hollow half sphere,it's up to the real applications and materials