San-X Kutusita Nyanko stamp set.
There are 8 rubber stamps and one ink pad.
Size of each stamp is about 0.5 inch. Please see pictures. A quarter coin is added to give an idea of the relative size of the stamps.
Size of the box is about 2.25 x 2.75 x 1.25 inch (5.5 x 7.5 x 3 cm)