Their "No BS Warranty" is total BS. It used to cover lost rings and rings damaged from use. It now cover only manufacturing defects AND you have to pay $10 for them to send a new ring. (Different spots on their website say different things. One spot does say tears are covered, but mine was rejected. The rings tear... They are literally silicone)
It is so absurd that I had to make a post about it.
Buy a whole pack of ThunderFit rings on Amazon for like $15. They are basically the same thing (a shitty disposable silicone ring) but they are actually appropriately priced.