I LOVE this!!! You can leave a message or your child's name on their rice or other bento foods! This is best used on deli meats, cheese or soft cooked veggies. They recommend that the food be less than 3mm so sliced cheese, deli ham etc would be perfect. If you want to use veggies (little carrots stars), boil the veggies first.If the meat/cheese gets stuck, just poke it out by tooth picks and etc.Each letter is about 1 cm long.I would wash by hand.