The HEXMAG HEXID Color Identification System is the first-ever patented color-coded ammunition identification system designed for safe and efficient magazine organization. This blue 4-pack kit includes matching follower and latch plate pairs molded from strong polymer.HEXMAG HEXID Blue Color Identification System (4-Pack)Patented color-coded system for quick caliber identificationAnti-tilt followers included in each packToolless installation - change out in under 1 minuteMatching latch plate and follower pairsEasy-to-see base plate color codingStrong polymer construction for durabilityEssential for shooters who need to quickly identify different calibers and ammunition types in their magazines helping keep different caliber magazines properly categorized and loaded for enhanced safety and efficiency.