Kumade is one of the Japanese amulet for good luck. It is the lucky item symbolized Eagle claw to grab all happiness.
It is great for business success and family happiness.
You should buy small one in the beginning, then you buy bigger and bigger for coming years. So, you have to buy new one every year. This is because you want to make your business bigger and bigger in the feature.
You should put Kumade at the entrance or any where your customers can see it. After the one year pass, you bring this to the shrine and buy new one.