Various Obstacle Tokens

- Disc diameter: 40mm - Thickness: 2mm - Material: chrome and glass - Pattern arrangement: radial with 2 levels - Contents: . 5 holes of Ø 25 / 50 / 75 / 100 / 200 µm . 5 pairs of Ø 75 µm holes, spaced from 100 to 500 µm . Various diffraction obstacles: square, rectangle, triangle, hexagon, keyhole . Interferences: pairs of squares, rectangles, triangles, hexagons, and triple holes