This is a Yamazaki magnetic folding door stopper in black, approximately W4.5 x D9.5 x H28cm, model 2487, from the Smart series. I am selling it because I no longer need it. I have confirmed that it works without any problems. The following is a product description: ・Weight: Approximately 280g ・Folded size: Approximately W4.5 x D3.5 x H16cm ・Expanded size: Approximately W4.5 x D9.5 x H28cm ・Compatible doors: Steel doors with a flat surface that magnets can attach to ・Size: Approximately W4.5 x D3.5 x H16cm ・Folds up slim when not in use ・Note: Cannot be installed on doors where the space between the bottom of the door and the ground is more than 10cm. ・A convenient front door stopper that can be operated while standing.