How do I open this tube?

The end of this tube is very hard. I slightly tried to punch the end of a knife into it and also tried a large paper clip but neither budged it. I was a bit timid in trying because I didn

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How do I still use this if the cap/tip is broken???

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How do I open this tube of filler? Cut end off or pierce the top? : r/DIYUK

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Microcentrifuge tubes are much easier to open with the FINEPCR Centrifuge Tube Cap Opener. Use the round end of the microcentrifuge tube opener to

Centrifuge Tube Cap Opener