Enamel pins are handmade items that have natural variations and slight flaws that can occur during the production process. As a disclaimer NO PIN will ever be 100% perfect. The Nice Noona pins are graded by the batch and overall complexity of the design. Keep in mind that everyone's grading system is different. A/B GRADESHighest quality pins from batch. (May contain minor imperfections that can only be seen under very close inspection. Speck of dust, stray glitter, uneven enamel, scratch on surface and or tiny bubble in enamel.)SECOND GRADESIf you wear your pins on a daily these would be great to have. They have the most visible defects.