Wide variety of nibs available.

Daler-Rowney FW Mixed Media Paint Marker replacement nib sets are available in a variety of nib sizes matching the different marker head sizes.
Each pack contains a number of nibs suitable for use with FW Mixed Media Paint Markers:

0.8mm Technical x 8 FW Mixed Media Markers Nibs.
These nibs can be used with the 101, 102, 103 and 104 Markers.

1-2mm Round  x 12 FW Mixed Media Markers Nibs.
These nibs can be used with the 101, 102, 103, 104 and 201 Markers.

1-3mm Chisel x 12 FW Mixed Media Markers Nibs.
These nibs can be used with the 101, 102, 103, 104, and 201 Markers.

1mm Hard Point x 10 FW Mixed Media Markers Nibs.
These nibs can be used with the 101, 102, 103 and 104 Markers.

2-4mm Round x 12 FW Mixed Media Markers Nibs.
These nibs can be used with the 201 and 202 Markers.

2-6mm Chisel x 12 FW Mixed Media Markers Nibs.
These nibs can be used with the 201, 202 and 203 Markers.

8-15mm Flat x 3 FW Mixed Media Markers Nibs.
These nibs can be used with the 301 Markers.