| Prismatical structure constructed inside the tube is safe by difects which can happen afterwords if the prismatical structure is inserted in a second moment. |
| Both shells connected by six radial beams, which are three-sided prismatical, opposite in pairs in the three dimensive axes. |
| Competitors use a polycarbonate tube, 6 meters long 100 mm wide, with inserted a adhesive prismatical film. |
| Made of nickel-plated aluminium, its prismatical shape results from an important erganomical study. |
| Prismatical Film can detach itself from the tube and cracking itslef. |
