I have a very large Bloodhound that has been getting these little guys for a years. He does NOT shred them. He chews(or is it sucks) on them for long long periods of time. He is not a gentle dog, but for some unknown reason- he does not hurt his bears. The only time they get destroyed is if one of his friends takes an interest, or the lawn mower finds one. A six pack lasts a good long time.
These are great - I've bought them many times. Best if you have a dog over 2 to 3 y/o. Most of my dogs have used them for squeaking, security totem, pillow, and attention-getters. If your dog likes to rip into things and tear them apart, these will not last 5 min. Still, at a low price, it might be worth it to you for your toy-killer to have 5 min. of fun.