This three choke set is easily identified with the appropriate shooting yardage lasered on the extended heads of the choke tubes. Carlson's exclusive offer includes a 3 choke tube case to keep your choke tubes safe inside your shooting bag. The TRAP Pak is manufactured from 17-4 heat treated stainless steel and designed to throw tighter and denser patterns than conventional choke tubes. These choke tubes feature a 25% longer parallel section in the choke, thus throwing more consistent patterns. Each choke tube is knurled on the end to allow for quick and easy removal. Each choke tube has the constriction and size laser marked on the end and body for easy reference.