Optically clear, castable silicone rubber for juggling spheres.

[corvuscorax]

Hey,
I'm looking for a cost-effective silicone-rubber solution for a run of juggling spheres. The rubber should be as optically transparent as possible as I will be casting various objects inside of them.

It needs to have high tear/stretch/abrasion resistance characteristics as these will be frequently hitting the ground/juggler and I want the impact to be soft/painless while offering maximum lifespan and optical clarity.

Some examples include:

http://www.smooth-on.com/Tin-Cure-Silicone-/c1113_1276/index.html

http://www.smooth-on.com/Solaris=-Silicon/c1381/index.html

Many thanks in advance.

 

[corvuscorax]

Another important characteristic I'm looking for is a shore hardness of around 25-A