Gnawing Toys

[Tomsmum]

my GP's have a constant supply of hay but still gnaw on their hutch. Are any gnawing toys particularly recommended or contra indicated?

 

[Blossom15]

Our piggies love twigs from our apple tree but that can be hard to find if you don't have one! Some guinea pigs will chew from boredom so toys and more out of cage time may help (not saying they're bored just may help!).
Can't help with recommended gnawing toys but when in doubt normally a cardboard box is a good distraction for my pigs!