Tegumentum spirale telescopicum e lamina chalybis elastici optimae qualitatis factum est et calore tractatum est ad partes cochleae sphaericae, axis et virgae protegendas. Manica protectora sine contactu cum membro protecto per limbum centralem in utroque extremo membri protecti affixum coniungitur. Securitas nexus inter manicam protectoram et limbum centralem propria vi elastica prae-compressiva efficitur, ita ut in operatione stabilis, flexibilis et flexibilis sit, et sonitum valde parvum habeat. Superficies nigra et nitida est, et cum plurimis partibus limbum machinae congruit.
Tegumentum cinguli spiralis chalybei tutelaris secundum parametros, ut diametrum cochleae sphaericae, partium axis et virgae, et spatium motus, aptatur. Quapropter, hae rationes in ordinatione adhibentur:
1. Usus secundum specificationes consuetas ab officina nostra provisas eliguntur.
2. Usuarii vaginam tutelarem D, Lmax, Lmin praebent (requisitum speciale D2)
Ab officina nostra designatum et fabricatum, pretium secundum specificationes consuetas computatur.
1. Limbum operculi spiralis chalybei protectoris ab usore fabricatur. Nostra officina delineationes praebet.
2. Pretium ordinis copiosi discountum habebit
3.D2 non requiritur nisi in magnitudinibus casibus specialibus.
| Specificationes | Lmax (mm) | Lmin (mm) | D1 (mm) | D2 (mm) | Specificationes | Lmax (mm) | Lmin (mm) | D1 (mm) | D2 (mm) |
| 20-250-30 | 250 | 30 | 20 | 40 | 70-400-80 | quadringenti | 80 | 70 | 95 |
| 30-250-45 | 250 | 45 | 3 | 41 | 70-750-100 | DCCCL | centum | 70 | 94 |
| 30-450-50 | 450 | 50 | 030 | 50 | 70-1400-120 | 1400 | CXX | 70 | 104 |
| 30-600-50 | DCCLX | 50 | 30 | 56 | 70-1800-120 | MDCCC | CXX | 70 | CXX |
| 40-300-45 | trecenti | 45 | 40 | 54 | 75-400-80 | quadringenti | 80 | 75 | 89 |
| 40-550-50 | 550 | 50 | 40 | 67 | 75-600-100 | DC | centum | 75 | 95 |
| 40-800-80 | DCCC | 80 | 40 | 65 | 75-900-120 | 900 | CXX | 75 | 97 |
| 40-950-80 | 950 | 80 | 40 | 69 | 75-1200-120 | 1200 | CXX | 75 | 104 |
| 50-550-50 | 550 | 50 | 45 | 73 | 75-1600-1100 | 1600 | 110 | 75 | 115 |
| 45-700-80 | DCC | 80 | 45 | 68 | 80-400-80 | quadringenti | 80 | 80 | 94 |
| 45-900-100 | 900 | centum | 45 | 70 | 80-600-120 | DC | CXX | 80 | 97 |
| 45-1000-100 | mille | centum | 45 | 73 | 80-900-110 | 900 | 110 | 80 | 105 |
| 50-500-50 | quingenti | 50 | 50 | 72 | 80-1200-120 | 1200 | CXX | 80 | 115 |
| 50-700-80 | DCC | 80 | 50 | 70 | 80-1400-120 | 1400 | CXX | 80 | CXX |
| 50-900-100 | 900 | centum | 50 | 77 | 85-400-80 | quadringenti | 80 | 85 | centum |
| 45-1200-100 | 1200 | centum | 50 | 84 | 85-600-100 | DC | centum | 85 | 105 |
| 55-350-50 | 350 | 50 | 50 | 72 | 85-800-125 | DCCC | 125 | 85 | 106 |
| 55-550-80 | 550 | 80 | 55 | 72 | 85-1000-125 | mille | 125 | 85 | 126 |
| 55-800-80 | DCCC | 80 | 55 | 78 | 85-1200-125 | 1200 | 125 | 85 | 132 |
| 55-1000-120 | mille | CXX | 55 | 77 | 90-400-100 | quadringenti | centum | 90 | 105 |
| 55-1400-110 | 1400 | 110 | 55 | 86 | 90-600-100 | DC | centum | 90 | 111 |
| 60-400-50 | quadringenti | 50 | 60 | 79 | 90-800-125 | DCCC | 125 | 90 | 111 |
| 60-600-80 | DC | 80 | 60 | 78 | 90-900-125 | 900 | 125 | 90 | 127 |
| 60-900-100 | 900 | centum | 60 | 87 | 90-1200-125 | 1200 | 125 | 90 | 137 |
| 60-1200-120 | 1200 | CXX | 60 | 88 | 95-400-100 | quadringenti | centum | 95 | 110 |
| 60-1600-120 | 1600 | CXX | 60 | 98 | 95-600-125 | DC | 125 | 95 | 112 |
| 65-400-50 | quadringenti | 0 | 65 | 85 | 95-800-125 | DCCC | 125 | 95 | 130 |
| 65-700-80 | DCC | 80 | 65 | 87 | 95-1000-125 | mille | 125 | 95 | 137 |
| 65-1000-100 | mille | centum | 65 | 95 | 100-600-120 | DC | 125 | centum | 118 |
| 65-1400-110 | 1400 | 110 | 65 | 99 | 100-800-120 | DCCC | CXX | centum | 135 |
| 65-1800-110 | MDCCC | 110 | 65 | 109 | 120-600-125 | DC | 125 | CXX | CL |