The Mk.2's are a bit better for tennis balls because they are a bit wider, hence hold tennis and especially slightly heavier balls like baseballs more securely. On the down side the gap in the middle is also wider so small stones fall through, reducing versatility to a degree. I'm making up as many as I can for you to take. Is that estimate of 60 for real? I will be able to do it by the time you arrive, but will have to allocate a bit more time. No charge of course but your boys will have to fit their own cords.

Aussieslinger

Still thinking about this...  Please make me up six (6) and I'll make up that many slings of differing length cords.  I think my new class format will be intro followed by me demo'g throws followed by my working with each boy individually to throw balls with one of your pouches.  I'll use a slip knot for the loop and figure eight for the release so I can migrate the knots to fit the boy.  After getting through all the boys throwing with the demo slings, then we'll have them each make a sling with my stuff to take home (watch out mummy and daddy).  They can do rocks on their own and away from the larger concentration of people.  I have been giving each of them a printed sheet describing how to get to your's, sv's and TechStuf's throws on the site (also Carlson's fig 8 and Tint's... well whatever it is you call Tint's).  My warnings about the helicopter and any multiple turn setup will be more strongly emphasized along with having them only do, under my supervision, one or two of those principle once-around three. 
I have to rework a trailer to accommodate a quick setup and erection of the backstop frame and net but that shouldn't take too long...  The new format will better lend itself to doing in town around other buildings and people also.

Thanks again for your help and support!!!

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I only want/need six but not sure if "only" applies 'cause I don't know how long they take to make up and/or how busy you are with visitors.

Thanks again for your help