2° the octagonal ring: it shall respect the provisions of paragraphs 4 and 8 of section 55 and meet the following specifications:a) the distance between 2 facing corners is 7.5 m (24 ft);
b) 8 posts of 1.7 m (5.5 ft) high in each corner of the ring are joined by a metal frame; the posts and frame shall be padded and covered with protective material;
c) a plastified metallic fence around the frame between each post;
d) the ring floor shall be covered with a protective mat of “ensolite” or an equivalent material at least 2.5 cm (1 in) thick and with a clean, tightly stretched canvas;
e) one of the segments surrounding the ring shall have a door permitting the entry of the participants; the said door shall have an outside lock.