This one belongs to the High-end series, it can be compared with the imported integrating spheres.The sphere was made of aluminum alloy through spinning.On the outer surface it is the enamel paint.So the whole sphere looks very pretty and the weight of it is very small.Compared to the iron one, there is a huge upgrade on the design as well as on the details.both 2pi and 4pi can be realized on this sphere.and this type can easily be separated so the small door will be no problem.
Specifications:
1)  internal diameter:2000mm
2)  meterial of the sphere:aluminium alloy
3)  internal coating:Baso4
4)  outside 2pi hole:700mm