Comparison : Item # C6500-2250-48-1, Nylon 6 FDA Natural
Item # C6500-2250-48-2.5, Nylon 6 FDA Natural
Item # C6500-2250-48-3, Nylon 6 FDA Natural
Item # C6500-2250-48-3.5, Nylon 6 FDA Natural
Item # C6500-2250-48-4, Nylon 6 FDA Natural