1. Crafted from high-quality aluminum material, making it lightweight and durable for use. 2. The ergonomic design effectively utilizes stampede action to enhance traction. 3. This is an intermediate drive motor chain adapter compatible with specific brands; you will need your own appropriate 104BCD chain. 4. The positive tooth corresponding chain tooth is wide, while the negative chain corresponds to a narrower tooth. 5. Universal fit; after installation, it can be paired with chainrings of 36, 38, 44, 46, 48, or other specifications. Material: aluminum Color: Silver Package Contents: 1 x Chainwheel Ring Adapter Only the above package content is included; other products are not featured. Note: Light shooting and different displays may cause the item's color in the picture to differ slightly from the actual product. The allowable measurement error is +/- 1-3cm.