This cleverly designed Modular Glass Pen by Korean ink maker Wearingeul, features a removable glass nib and smooth wooden holder. You can enjoy swatching and writing with multiple inks instead of worrying about protecting the glass tip and body. Paired with a metal screw-on cap, you can even take this pen on the go. Glass pens are compatible with fountain pen inks and calligraphy as well as pigment and shimmer inks. Gently wash off the nib in water and you're ready to switch to a different ink.