Trodat 55510 Professional 5mm 10 band NumbererTrodat Professional 4. 0 Numberer Stamp (55510) The Trodat Professional 4. 0 Numberer (55510) is a heavy duty, self inking stamp designed for frequent use in offices, warehouses, and manufacturing environments. Key features: 10 digit consecutive numbering: Ideal for invoices, receipts, inventory control, and other tasks requiring sequential numbering. 5mm character size: Clear and easy to read impressions. Self inking design: Built in ink pad ensures