couturex pin super f 500g ec6 n 4Item description according to supplier: The nickel plated steel is perfectly polished which gives them an incomparable glide. Thanks to their flawless tip, these pins will go through your most delicate fabrics without leaving any trace and without damaging the fabric. (19,680 pins kg). Size equivalence: No. 4 = 30 mm 0. 50 mm Supplier Article Number: 44212