I was thinking of purchasing an ink stick. The one I am looking at is 16cm * 3.5cm * 1.7cm. How much ink can I make from this stick. These come in set of 3 and I don't think I will use it that much. I will mostly be using it with dip pen or glass pen mostly for drawing. https://www.aliexpress.com/item/32955351137.html?spm=a2g0o.cart.0.0.7c2e3c00C9nZKp&mp=1 Can anyone tell me if these ones are good. I don't really know what to look for in ink sticks. There is no description. What info I should ask the seller?