Wacom Intuos4 Chisel Felt Nibs (5-Pack)

Is this the nib that is approx 1 & 1/8th inch (28cm) long or the nib that is 3/4th inch (20cm) long? Listing the tablets is (sort of, but not entirely) irrelevant, it's the pen that the nibs are for. The art pen and the Pro Pen (v 1) use the longer nibs; the Pro Pen 2 uses the shorter nibs. The tablets listed are all compatible with all 3 pens, but the pens take different nibs. And then there's the airbrush pen ....