/usr/share/sofa/examples/Demos/Ophtalmo/data/mesh/Grab_instrument_right_inside.mtl is in sofa-data 1.0~beta4-11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | newmtl Grab_instrument_right_phong2SG
illum 4
Kd 0.85 0.85 0.85
Ka 0.10 0.10 0.10
Tf 1.00 1.00 1.00
Ni 1.00
Ks 0.90 0.90 0.90
Ns 43.74
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