The hamsters that died at the result of this fluffy bedding material died of blockages and choking. Cedar chips and pine chips should also be avoided. Pine and cedar have strong oils and are odorous. Pine and cedar can cause respiratory problems in hamsters. A good wood shaving bedding material is Aspen shavings.
Paper based shavings are also available and are safe.
The material should be torn into small strips. Hay works great as long as it is clean, not moldy or dusty. Straw can be too sharp and can injure the hamster. A good water bottle is a must. Pick out a high quality water bottle because the cheaper ones are susceptible to leakage.