Well suitable for making filters. Often finds use in vacuum tube amplifiers.
Russian MBM capacitors are the analog without glass and iron of the K40Y-9 (K40U-9) type.
MBM and K40 can replace each other in almost any schematic design. Of course, the K40 is slightly better, but the price of this one is much lower, mostly because people don't know the old school MBM type.