PURPLESKY Black Bobby Pins - Make it Easy to Start Your Hair Styling Material: high-quality coated steel, stainless & rust-resistant, but NOT Stainless Steel. Quantity: about 390 pieces each box, may vary a bit from each box. Size: 5cm/1.97inch. How do we calculate? Average net weight per piece: about 0.7 g; Net weight of all the pieces per box: ab..