Just wanted to add my $.02 worth. I bought a couple dz. white Nirks about a month ago and so far have had 3 break. Each time coming to full draw and each time I thought the string broke. This is with a 40# recurve with a B-50 string and no modifications of the nocks, i.e. sanding, boiling etc. Bought them thru 3 Rivers so I called to ask if they had heard of any problems with them. Referred them to this forum as they had not had any complaints. They asked me to email pictures of the nock(s). Have not heard back yet.