I've seen ... 15 plastic nocks in various stages of failure ... and ALL of them were cracking from INSIDE the arrow up to the bottom of the moon valley. It's very unlikely you would notice an issue until you had a "cataclysmic disassembly."I will not be useing another plastic nock. I am careful loading and I did not see anything that would tell me the nock was about to blow up in my face. I am trying to have the most accurate weapon I can (safely).