The Pilot Super Color Broad is small yet mighty. It's not the size that matters, but how you use it. These are a special edition marker made by Egg Shell Markers, that can fit in the palm of your hand.
Filled with Pilot Super Permanent Ink nib size 1/4 inch x 1/8 inches.
You may refill by pulling out the nib and adding a bit of ink into the barrel.