Welcome to our store!</br> 1、High strength aluminum alloy material, hardness higher than steel, not easy to deform. 2、Aluminum alloy body, the surface is anodized, the color is bright and corrosion resistant. 3、CNC precision machining, high hardness, upgraded wear resistance, fine workmanship. 4、Positive and negative tooth design to prevent chain drop and install simply, thickness is only 4mm/0.2in. 5、It is an excellent bicycle modification accessory with stable and reliable performance. <p class="wang-edit-text">Item Type: Positive and Negative Tooth Disc Product Name: Round 30T Chainring Material: Aluminum Alloy Thickness: Approx. 4mm/0.2in BCD: Approx. 104mm/4.1in Weight: Approx. 60g/2.1oz <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x&nbsp;Chainring&nbsp; (Customer Satisfaction) - is our priority. If you notice any problems with the products after receiving the goods, such as damaged goods or incorrect quantity, please contact us immediately. We will do our best to provide you with satisfactory after-sale service.</br>