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1. The cylinders, balls, cones and bicones prescribed in these regulations may be replaced by devices having the same appearance when seen from a distance.

2. Their colours shall not be faded or dirty.

3. The following minimal dimensions shall be met:

(a) For cylinders, a height of 0.80 m and a diameter of 0.50 m;

(b) For balls, a diameter of 0.60 m;

(c) For cones, a height of 0.60 m and a diameter at the base of 0.60 m;

(d) For bicones, a height of 0.80 m and a diameter at the base of 0.50 m.

4. Notwithstanding paragraph 3, for small craft the use of signal body with smaller dimension is permitted, as long as these bodies are large enough to be easily visible.