Quantity: 24 pairs of heel tips in 6 sizes of 8 mm, 9 mm 10mm 11mm 12mm and 12.5 mm, U-shaped, metal pins have 2 sizes of 2.4 mm and 3 mm Features: these shoe repair taps with anti-slip surface are engineered to minimize clacking sound on your high heels, no trouble with walking sound Durable: made of TPU (thermoplastic polyurethanes) and strong iron, hard and durable, provides long using life, easy and comfortable to use