Suitable for: Royal canister vacuum models: 401, 666, 4100, 4200, 4300, 4400, 4500, 4150, 4250, 4350, 4600, 4650, 4700, 4750 Metal Pony Tank

For optimum performance:

• Change your vacuum bag every 2 to 3 months to maximize cleaning and keep your home free of dirt and dust.
• Change vacuum bags before they are full in order to keep your vacuum running efficiently.