Chewing wood for hamster = 473 yen ($4.68 €3.35)

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