350pcs 6.5mm/0.26/quot; Winter Pointed / Concave Tyre spikes Tungsten Pin Snow Tire Gripping Studs Racing Mountain Bicycle Fatbike /Great Anti-slip Function/When you install these studs to your tire, it brings a good anti-slip property for your tires. For both tire customer have tested need about 350pcs for both tires . /Perfect Performance /The greatest advantage of the tire spike is that it has a low ground pressure and it is environmentally with minimum impact / High Quality /This tire screw is constructed from high-strength steel, wear-resistance, ensure maximum strength and durability for long lasting usage, rational design, convenient to use. The main difference between winter tires with tipped spikes and concave spikes lies in their design and performance on icy or snowy surfaces. Tipped spikes typically have a pointed shape that provides improved traction on icy roads. Their design allows them to bite into the ice, providing better grip and stability. However, they may not perform as well on bare pavement, as they can cause increased noise and vibration. On the other hand, concave spikes have a curved shape, which allows for more surface contact with the road. This design offers better traction on both icy and bare pavement, resulting in improved handling and reduced noise. Concave spikes also provide good grip during acceleration and braking, making them a popular choice for winter tires.