This is the softest level in any given shape. It's very chewy you can really "sink your teeth" into it.
Recommended for mild chewers who don't usually chew through things. If you’re not sure which level to get, start here.
This is the middle level. It’s firmer, but still chewy and resilient. A good “middle of the road” option.
Recommended for moderate chewers who sometimes chew through things.
This is the toughest level. It’s VERY firm with a lot of resistance.
Recommended for avid chewers who frequently chew through tough things. Although no chew tool is indestructible, this is usually the longest lasting level for very heavy chewers.