Testing materials for friction

14f751ff-bcba-4c24-9a5c-a103ad79b39d1x1
14f751ff-bcba-4c24-9a5c-a103ad79b39d1x1.jpg
2064
14f751ff-bcba-4c24-9a5c-a103ad79b39d1x1
9e744579-4a9f-4429-aee5-e3e03db940e01x1
9e744579-4a9f-4429-aee5-e3e03db940e01x1.jpg
2063
9e744579-4a9f-4429-aee5-e3e03db940e01x1
8b9743e1-146b-4e37-8108-0899d19fd5041x1
8b9743e1-146b-4e37-8108-0899d19fd5041x1.jpg
2062
8b9743e1-146b-4e37-8108-0899d19fd5041x1
4b347519-d488-4731-ac54-4fd0888e6ff81x1
4b347519-d488-4731-ac54-4fd0888e6ff81x1.jpg
2061
4b347519-d488-4731-ac54-4fd0888e6ff81x1
4aef1a38-4200-418c-b023-77074faf04111x1
4aef1a38-4200-418c-b023-77074faf04111x1.jpg
2060
4aef1a38-4200-418c-b023-77074faf04111x1
b4bd6b97-6e5a-4b33-903e-41691de0d52a1x1
b4bd6b97-6e5a-4b33-903e-41691de0d52a1x1.jpg
2059
b4bd6b97-6e5a-4b33-903e-41691de0d52a1x1
ab458c05-fff5-4b3a-8ff6-3d31aa4be83f1x1
ab458c05-fff5-4b3a-8ff6-3d31aa4be83f1x1.jpg
2058
ab458c05-fff5-4b3a-8ff6-3d31aa4be83f1x1
1111339f-d7d9-4e2b-8d33-b0f1d3f0551b1x1
1111339f-d7d9-4e2b-8d33-b0f1d3f0551b1x1.jpg
2057
1111339f-d7d9-4e2b-8d33-b0f1d3f0551b1x1