The internal buckle structure is cross-shaped, which makes the card stronger.Strong reflections occur at night under the illumination of lights such as cars and flashlights, which play a role in safety protection.The product is made of reflective material, does not emit light by itself, does not contain fluorescent agent, it will reflect light under the irradiation of light, and it will not reflect light or shine when there is no light.The length of the prouct is 8cm, and the width is 0.5cm. Inner diameter is 1.9mm-2.4mm and outer diameter is 5mm.Normal bicycle spokes can be used. It is used on bicycle wire. It can be used for a long time, can be used in the sun or rain.Item Name: Reflective Card StripsMaterial: ABSSize Details: 8cm x 0.5cm/3.15" x 0.20" (Approx.)Notes:Only round steel wire spokes can be installed.Installation Method:Point the position of the spoke reflective strip to the spoke, and press it down to get stuck on the spoke (press from one end to the other, so that it saves effort), it is not easy to fall.Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:12 x Reflective Card Strips