Jay - information about the Weight Kit can be found online in the product pages under "Gallery" and in more detail in the catalogs - also found online:

Product Page: http://www.titleist.com/golf-clubs/drivers/910D2.aspx

 

Titleist 910 metals feature a precision bezel 

weight, directly in-line with the club's CG, to 

provide superior stability and adjustability. 

An optional precision weight kit is available 

with 2g, 5g, 7g, 9g and 12g weights to adjust 

swingweight and feel with different shafts.

 

PDF:  http://www.titleist.com/images/products/pdfs/910_drivers.pdf

I realise that this is a 12 year old thread but I have to add my bit!

Please feel free to comment.

I have 3 of these weight kits. Yes - I'm still playing the 910 range!

I have 4 different drivers, 6 different fairway woods and 6 different hybrids. I tinker a lot!

Most of the clubs have a Red Weight. One of the hybrids has a Blue Weight. As far as I know, all of these were fitted at the factory.

The red weight in one of the kits was mistakenly replaced with a green weight - I bought that kit second-hand some years ago. The previous owner must have swapped the green out of their club for the red.

Aside, I have accurately measured every red weight in my possession and the results are startling.

Out of the total of 16 red weights, which should measure 7 grams, only 4 actually weigh in at the correct weight.

The other 12 range between 8 and 6 grams.

OK, you might say there has to be a tolerance and 1 gram either way may be reasonable, but when you look at the other colours, i.e. Blue, Black, White and Green, they are all spot on to there respective specified weights.

I find this very strange because the most widely used or fitted weight to this range of clubs as a whole, looking at the ones I own and others that I've seen are all but the odd one, coloured Red for 7 grams.

Surely if this is the most used weight, it should be just as accurate as the rest?

Perhaps someone from Titleist would like to comment.