They are made of marine vinyl, it is soft and springy but very strong. I can make them to your spec. I use plastic pellets and add zinc plated BB's for weight if needed. They are stitched with upholstery thread.
I have tossed one of these in the air and hit it with a soft ball bat with no damage done.
All I have is white at the moment as it is a good color to see in the grass. If enough people want them, I will get some other colors.
They are $18 shipped in the US, just PM me for details.
