Curve nuts are designed to contact the rock at three points, making them effective in flare cracks and piton scars. The heavily tapered head, both front-to-back and top-to-bottom, allows for easy placement and a secure hold. This curve nut package includes a set from #1 to #10. I have only used some of the sizes (#3) a few times, and the others are almost unused. There are some signs of contact with the rock and minor scratches, but there is no damage that affects performance. I have inspected and lightly cleaned the entire set before listing. ⚠️【Important Notes & Disclaimer】 Climbing protection is gear that can be a matter of life and death. Please use used gear at your own risk. Please be aware that there are risks that cannot be determined by appearance, such as impact from falls, aging, and metal fatigue due to storage conditions. 【Shipping】 ・I will carefully package and ship via anonymous delivery. ・Instant purchase is welcome.