What is this component?

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Hello everybody. Does anybody know what is this red component with black stripe on one end? I found that some of theese are faulty. They are giving me reading all around from 10-60 k ohms, but only in one diretion. In diode mode - nothing. I know that they are problem because i changed them with another ones from identical board, and now everything works... Thanks in advance
 

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Glass capacitors or possible gas tube transient protectors.






Regards, Dana.
 

Omg theese are really diodes. But this whole board is covered by coating... And it looks like how much i tried that i couldn't make a good contact with leads when I was measuring in diode mode. When I took them off and scraped really good I can get a voltage drop of a diode in one direction... Probabbly some kind of fast switching diodes, becase they are getting a square wawe signal from that capacitor next to it which is generated by 555. LL4148 probabbly like Barry said
 

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