Walter Harrison's Tissue Bedding Large Walter Harrison's Tissue Bedding is made from a non-toxic material which is completely safe for hamsters, guinea pigs, chinchillas, rats, mice, gerbils, degus, ferrets and reptiles. Walter Harrison's Tissue Bedding is soft and comfortable and will make a cosy bed for your small animal. Safe and warm, Walter Harrison's Tissue Bedding is 100% bio-degradable.