This is a "moth-proofing, mold-proofing, and anti-mite sheet" from Kohin. These are leftovers from last year's use. Originally, there were three sheets, but one is unused, and the other two are used, so it's enough for about 2 tatami mats plus a little extra. Unused sheet: 100 x 380 cm Remaining sheets: 100 x 37 cm, 100 x 40 cm