The filter thread size of Nikon AF-S DX Nikkor 18-105mm f3.5-5.6G ED VR is 67mm.
Below are links to the filters that we recommend you to consider for your Nikon 18-105mm f3.5-5.6G ED VR:
Read our detailed Nikon AF-S DX Nikkor 18-105mm f3.5-5.6G ED VR Review