Small - 8cm x 4 , fits on hand - music box with choice of favourite melodies. We have sold these for years at the shop, now they're on line.
Actually, they're echoes, so when you wind the handle and the box is in the air, you won't hear anything. Sit the box on a surface though - wood is best, it's resonant - and a delightful tune is heard. Great for lullabies, for birthdays, or just for pleasure