Comparison : Item # C6500-4000-48-1, Nylon 6 FDA Natural
Item # C6500-2250-48-4, Nylon 6 FDA Natural
Item # C6500-2250-48-4.5, Nylon 6 FDA Natural
Item # C6500-2250-48-5, Nylon 6 FDA Natural
Item # C6500-2250-48-6, Nylon 6 FDA Natural