●Material: Metal. High Quality (can suck magnet) ●4 size 2.2 inches / 56.9 mm; 2.5 inches = 63.9 mm; 2.75 inches = 69.9 mm; 3 inches = 76.9 mm. ●Your collar will remain unspoiled and fresh all day long. ●Contents: 40 pieces (10 pieces per size) with original case ●Ideal gift for birthdays, Fathers Day, graduations, weddings, anniversaries, Christmas, etc.