Specifications: 1)Internal DIA:25mm,38mm,50mm 2)Range of the reflectance:200nm-2500nm 3)The reflectance:90%-98% 4)The structure outside:The material always be aluminium alloy and it can be customized Features: The biggest difference of the sphere between this series and other series is that the interna coating is made of the material striaghtly,and then we install the external shell to it .When doing the common sphere usually we first do the sphere shell and then spray the coating to the internal surface of the shell.So in the structure,the coating is very strong and it never drop out and goes yellow theoretically.When using thesphere,the principle is same as the common sphere. Perfornmance indictors: 1) Lifetime of machinery:10years 2) Lifetime of diffuse reflective coating:5years 3) Stability:Room temperature/High temperature 4) Humility:20-80%RH 5) Storage Conditiion:Rain/Dust proof