Outer diameter: 5mmMaterial: ABS + colorful reflective filmLength: 75mmContains: 1pc reflective stripDue to manual measurement, please allow a difference of 2-4cm, thank you (all sizes are in cm, please note that 1cm=0.39in)A variety of colors are available: fluorescent yellow, white, orange, red, blue, silver gray, which can be freely matched;Note: Due to the difference of different monitors, the picture may not reflect the actual color of the product, thank you!Product features: colorful reflective products, colorful reflective spokes for bicycles, according to the principle of light source refraction to direct light from a distance to the luminous place, no matter day or night, it has a good retroreflective optical effect, making it easier for driving vehicles to find cycling The existence of bicycles plays a very good reflective warning function, and provides a great guarantee for the personal of cyclists;Specification: 12 pieces per pack, DIY pattern, the number of pieces required for the whole vehicle is related to the complexity of the pattern