Bought a similar ball from a well known pet shop and it was rubbish, a nightmare to put together and wouldn't stay together would have been worried hamster would have escaped. This one is sturdy and he hasn't got out once.
Enables gerbils to explore the house and the kids like to build assault courses(flat of course) out of cushions etc. the ball can poo open if gerbils hit sonething hard at speed. tjis hapoened with a crash into the cooker, gerbil esvaped but jumped back in for more fun!!!