Yall , I just need to jump in here. I bought foam board at Hobby Lobby for $2.00 a piece ( large size) But I found some for $2.00 at Dollar General. So at DG I bought 10 pieces. What a mistake !!! It was a form of foam board but when cut into pieces , it left a mess of torn paper and it bent very easily. I found out by taking it apart that the foam part is not solid like at HL. it is in channels . So for my money , I'm not gonna go that route again. But the crease doesn't bother me either.