| Official name | SL-4 R/B |
| Alternative name | Blok-I (Soyuz 11A511) |
| Cospar ID | 1969-087B |
| Norad ID | 4127 |
| Launch date | 1969-10-13 |
| Launch site | TTMTR |
| Launch vehicle | Soyuz |
| RCS size | UNKNOWN |
| Decay date | 1969-10-16 |
| Shape | Cyl |
| Mass (kg) | 2378.59 |
| Diameter (m) | 2.66 |
| Height (m) | 6.7 |
| Span (m^2) | 6.7 |






