Help Ligatures for partial hanging

[sximii]

I found these too at home. They're both used for cats, the black one for those cat carrier things and the orange one is a leash, so I assume they're both pretty strong. Do they seem good enough?

 

[DivineSpark]

Black one seems like stronger than orange, but still too risky I would say.

 

[sximii]

Black one seems like stronger than orange, but still too risky I would say.

how would I be able to check their strength