Robert,

The Lego site has an illustrated list of parts in the Mechanisms Set 
(979632). Go to the Lego store site, search on that part number, then 
click "Element Survey" under the picture of the kit, to download a 
parts inventory.

It looks to me like mostly standard-issue Technics parts. There are 
some triangular and circular blue sheet pieces, but those aren't even 
used in the four models illustrated in the ad for the Pneumatic 
Add-On Set.

Seems to me you could get the pneumatics set, then if there are one 
or two specific pieces you need, you could follow Greg's advice to 
get them from Bricklink, and still save most of the $85.

Cheers,
Mike

>We're thinking about adding pneumatics this year, and our team was
>wondering what Lego kits we need to have to facilitate this. I see the
>"Mechanisms Pneumatics Add-On Set" #W979641 (see
>https://www.legoeducation.com/store/detail.aspx?KeyWords=pne
>umatics&by=20&ID=1572&c=0&t=0&l=0 or http://tinyurl.com/4amaj8). The
>verbiage on that item says that this kit "Requires Mechanisms Set
>(979632)". Is this really true? We already have the NXT and RCX kits,
>along with a large selection of other Lego pieces. Do we really need
>the Mechanisms set? Or is that just for people (teachers) who don't
>have additional pieces in their classroom and need pieces (gears,
>etc.) to have the pneumatics drive.
>
>(As an aside, I can't find on the Lego Education web site where the
>description lists the pieces in the kit. It is very annoying to buy a
>collection of pieces without knowing exactly what pieces are in the
>collection.)
>
>Thanks for any help you can provide.
>
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