My wife bought a chewing wood for our hamster. It cost 473 yen ($4.68 €3.35). Unfortunately the hamster is not interested in this wood. The hamster does not chew it.
She also bought a chewing dishcloth gourd for the hamster. Its price was 242 yen ($2.40 €1.72). Fortunately the hamster chewed it.
Chewed dishcloth gourd