Define lasting. Do the balls just get soft and beaten or are they falling apart?
If durability is that much of an issue, I'd be thinking of a one piece plastic or rubber ball with a fake seam.
The ball starts to come apart..
I found this page..
SG - Product Page
Check it out.It has a lot of stuff.
Currently I use this ball-
Seamer
Two-piece ball of Alum tanned leather. Dyed red throughout
Good quality centre construction encased with layers of top quality Portuguese cork, wound under tension with 100% wool
Full naturally seasoned inner core
Ideal for practice at club and school level
Ideal for practice, even in wet conditions
Other balls-
ProSoft
Soft poly ball that looks like a leather cricket ball. Exact same dimensions
Prominent linen seam just like real cricket ball
Great for all weather play with minimal protective gear
No risk of personal injuries
However, use of Abdominal protector recommended
Ideal for indoor play or in cramped spaces
And,
Everlast (Synthetic)
Synthetic weather-proof PU ball
Exact weight and size specification as of regulation cricket ball even with replica seams
Does not damage cricket bat. In fact, bounce and hardness very similar to the real thing
Perpetual shape and colour retention
Ideal for practice, even in wet conditions
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The real question is that do synthetic balls really harm a cricket bat???
Have anyone of you heard about this??