25 box protectors for standard Japanese Game Boy and standard Japanese Game Boy Color games!   There could be some odd sizes of these that don't fit so please check the dimensions below to see if this size will work for yours.

4 7/8 x 3 15/16 x 7/8 or roughly 12.4 x 10 x 2.2cm.

We also have Japanese Gamecube  (2 sizes!) , Japanese Game Boy Advance, Famicom, Super Famicom and Japanese N64 box protectors! 

Acid Free 12mil PET plastic

Crystal Clear