For easy identification and warning of potential hazards, use Red Tear Flags from Presco. These are made of durable and heavy-duty 3 Mil co-extruded polyethylene material. And red color tear flags are highly visible and warn against potential hazards. They can be stapled, nailed, tied, or taped as a warning. They are also perforated for easy dispensing. Presco red tear flags are sold in rolls of 300 flags.