Indestructible toys

Anyone out there have experiences with toys that last more than a day? Rocky turned 3 on 5/28/08 and again I bought him new toys. One was a rubbery round toy with spikes on a rope. He as chewed the rope off so far, although he is enjoying the rubbery ball. THe other toy was just a nylarbone but in the middle has bumps for teeth cleaning. He likes that too. Would love some other suggestions.