Instruments, uniforms, costumes, props, vehicles and everything else. If it is an inventory item you want to track, you can manage it in Aria. Define the asset type, the specific asset, reference number (serial number) and add notes about the item.
Once you have defined types of assets and created individual items, you can start assigning them to people. Record to whom and when it was assigned as well as the condition of the item and then record when it is returned and the condition at that time.
Because all history associated with an inventory item can be tracked, you have a complete picture of all of your assets: purchase date, who had it when, the condition it is in now and when it is retired.