Manufacturer: NaturalPoint. An extra 52 reflective track dots for the NaturalPoint TrackIR & SmartNAV series of products. Lost or worn out all the dots which came supplied with your TrackIR or SmartNAV and dont have a TrackClip or TrackClip Pro on hand? Then this product is for you! The square gots are approx 13mm x 13mm and the round dots have an approx diameter of 7mm.