This set of large stamper pens are brilliant for children and adults alike! There are 10 different colours, each with their own individual stamp including heart, star, lips, cat, paw print, spider, smiley face, dolphin, shamrock and arrow. The box they are set in doubles up as a vertical holder for the pens, making it easier for you to select them quickly.
The stamper part of the pen is very durable and seems to be resilient to repeated stamping which is of course what it's for, therefore I think these would be particularly long lasting for children who might not be as careful with them as adults! Each pen is 11.5cm x 2cm so they are very chunky and easy to hold in little hands (3+). They are non-toxic and water-based, so are safe, will wash out of fabrics and won't bleed through most paper stock. The colours are really bold & intense, and they dry really quickly too so less chance of smudging them.
These are not just for children though, I've found them to be a fun addition to the illustrations in adult colouring books as you can see in the pictures below. I also use them to embellish greetings cards to give it that personal touch, like using the paw print or cat stamp to include your pet when you sign the message inside.
You can find these pens on Amazon here:
Fibracolor Megastamp Pens