LAMY Z108 POM round for LAMY AL-star EMR Stylus Tip Writing on matt surfaces creates a similar feel to writing on paper. The POM nib is a rounded nib and is ideally suited for these surfaces. Nib radius: 0.7 mm. Included in delivery: 4 pieces When protective films are used, a choice must be made between PC/EL and POM, depending on the glide properties of the film surface. The right choice can only be found by trying out the tips. The rule here is that tips made of PC/EL are suitable for hard and smooth (glass-like) surfaces and tips made of POM are suitable for hard and matt (paper-like) surfaces.