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13. Inventoriesin CHF millions 2023 2022Raw materials 24.9 27.8 Work in progress 4.6 5.0 Finished goods 1,151.4 1,284.2 Total inventories %u2013 gross 1,180.9 1,317.0 Provision for obsolete and slow moving stock (42.9) (39.7) Total inventories 1,138.0 1,277.3 Details of change in impairment for inventories:in CHF millions 2023 2022As of January 1 39.7 43.3 Increase in provision for inventories 41.2 31.0 Unused amount reversed (27.7) (23.4) Utilized during the year (6.4) (9.0) Exchange differences (3.9) (2.2) As of December 31 42.9 39.7 14. Prepaid Expenses and Contract Assetsin CHF millions 2023 2022Prepaid expenses 23.5 10.0 Contract assets 8.5 15.0 Total prepaid expenses and contract assets 32.0 25.0 Contract assets primarily relate to the Group%u2019s rights to consideration for projects completed but not billed due to the final acceptance of the customer being outstanding. There was no impact on contract assets as a result of acquisitions. The contract assets are transferred to receivables when the rights become unconditional. This usually occurs when the Group is entitled to issue an invoice to the customer.78 Consolidated Financial Statements DKSH Group