FEIFAN Black 3K Full Carbon Fiber Road MTB Mountain Bicycle Seatpost 350mm length Quick disassembling. Easy to install. Weight: About 240g; Size: 350*31.6mm NOTE; Make sure the seat post you are looking for is size 31.6mm*350mm .So, your bike frame will fit this seat post perfect NOTE :The bolts been screwed into the nut's hole slowly,when you are installing the seat post If you can not make it successfully,Please loosen it and screw it agains slowly. Screwing it forcely that will damage the nuts and bolts. Package include :1 * 31.6*350mm seatpost