If you tell us your width and height inches before purchasing, we can tell you how many you need to buy. price is for 1 piece.-1 piece is 0.26 m2. -2 pieces 0.53 m2 wall containers-dimensional width: 70 cm x height 38 cm-thickness: 4 mm-100% erasable.-tile, wall, glass, wood sticks everywhere-product does not break cracking and can be folded flexibly.-you can cut it easily with science or scissors.-adhesive is very strong. (1. quality) you can make your own wall with self-adhesive newwall "colored walls" products. is not affected by odorless construction chemicals. resistant to impacts lightweight, elastic and environment-friendly. maximum 20 pieces of this product can be ordered. swordslife reserves the right to cancel orders over 20 units. more than 100 stocks are offered to be sold at the campaign price. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.