These paper boards are called Tanzaku.
We can use it for Butsudan ceremony.
Butsudan is one of the most important ceremony in our house.
You can buy Tanzaku at Japanese book store or general store.
After you write your surname on it,please use the board forever.
I mean you don't have to change the board unless it get big damage.
But if you changed your surname,please change the board.(For example:Marriage)
Your current surname is important.
I have already wrote about detail Butsudan manner.
Please check the post occasionally because I sometimes add information.
And I changed this old article a little. → Playing for ancestors
That article was not enough at all.
In Japan,there is Butsudan-purpose ash powder.(photos)
But you can use baking soda powder instead of Japanese ash powder.
(I recommended salt before.But it was not good. Do not use salt.)
Ash powder from used incense sticks is saved in your ash bowl every day.
The accumulated powder has your ancestors atmosphere.(Special magnetic force)
So,do not touch it with bare hands.