I think it's a great deal since it was originally 1100 yen for a set of 5! ☆ I bought these because the striped pattern is cute, the muted gray color is stylish, and the texture was nice, but they didn't fit my home's staircase size, so I've kept them unopened and unused at home. ☆ This product contains 5 mats per set, and this is a sale of 4 sets, for a total of 20 mats. ☆ These are stair mats that can be laid one step at a time, and the back is fully processed with non-slip material to prevent slipping. They also help to reduce the sound of footsteps and prevent scratches, and are useful for cold feet in the cold season. They are also recommended for homes with small children or pets. They can be washed by hand if they get dirty, so you can keep them clean♪ ☆ Although they are new and unopened, please refrain from purchasing if you are looking for perfection or are nervous, as they are stored at home by an amateur m(_ _)m