This is a child seat for OGK Giken child-carrying bicycles. It was used for about 3 years on a Panasonic Gyutto Annys, and has been stored indoors after removal. During the period of use, it was kept in a covered indoor parking area, so I think there is very little sun damage. I purchased and used a thick cushion from the manufacturer LABOCLE, so I will include this as well. There is no instruction manual, but you can download it by searching for the model number. I believe all the parts are included, but I cannot guarantee it. The photos show everything. Please prepare a hex wrench for installation. Excerpt from the manufacturer's website: Applicable age and height: Children aged 1 year (12 months) to under 4 years (48 months) old, and under 100cm tall. Applicable weight: Under 15kg Compatible bicycles: 24-27 inch city bikes (women's bikes/lightweight bikes) and bicycles of 20 inches or more specified by the bicycle manufacturer (※limited to bicycles with a double-sided stand. It is desirable to install on a bicycle equipped with a handlebar stopper.) ※Handlebar diameter: Φ22.2mm Handlepost diameter: Φ22.2mm Handle stem protrusion: 40mm, 50mm, 60mm ※Installation may not be possible depending on the shape of the diamond frame or handlebars. ※Cannot be installed on bicycles where the bicycle manufacturer restricts installation.