Goods are returned at your expense. Returned goods must arrive in original condition otherwise you will be charged for them. Unused workbooks (in original condition) may be returned for a full credit no later than 30 days following delivery. For goods not issued on an inspection basis, you must first contact BIOZONE International for a Returned Merchandise Authorisation (RMA) number to return goods. Returned goods will not be accepted nor any credit given without an RMA number accompanying the returned goods.