Shells

I have a bunch of shells from my trips to Florida. They are sitting in a jar on the mantle. I dug through the jar and picked out three that I thought might be fun to draw. The large one is a piece of a sea biscut, I am not sure what the other two are called.  No matter how many times I get them out and shake them they still produce white sand. It was very cold today, since I can't actually be in Florida at least I can day dream about it and play with my shells. I used a black Sakura Micron .02 pen for this drawing. My favorite Faber Castell S Pitt Pen had to be thrown out because it was broken in an unfortunate incident of someone's (not mine) over enthusiastic drawing. I really need to get another one. I would trade all of the pens I have for just one Faber Castell size S. (no I am not being paid to say that) What have you been drawing?