Is a material (shader) that represents glassy or glossy surfaces (such as car moldings, telephones, bathroom fittings) with a hard specular highlight.
You can find this material in the Create bar.
The soft highlights on Blinn surfaces are less likely to exhibit roping or flickering for thin highlights than the harder highlights on Phong surfaces. Use the Blinn surface material for surfaces with bump or displacement maps to reduce highlight roping or flickering.