OK, so I forgot about this...the spear in its original form is actually kind of oval. Master Replicas 'corrected' this, and made it more round. It's a little thinner in the middle, varying between just under 3" and 3-1/4". At each end, it flares out to anywhere between 3" and 4".
The spear tips are 2" long, with the final, single tip between closer to 2.5". Diameter at the base of them is 5/8" for the first set, and 1/2" for the next set and also 1/2" for the last one.
Hope that helps!