Each ruler is 18 inches long and has recessed markings for inches down to 1/16 of an inch and centimeters down to 1mm. Wash rulers in warm, soapy water. Not dishwasher safe.

This product contains the following chemicals which appear on the California Department of Toxic Substances Control Authoritative Lists detailed below. Information about the lists may be viewed at https://dtsc.ca.gov/scp/authoritative-lists/.

Chemical	Authoritative List
Aluminum	ATSDR Neurotoxicants
Aluminum	California Maximum Contaminant Levels
Aluminum	California Water Body Pollutants 303(d)
Barium	California Maximum Contaminant Levels
Barium	CDC 4th National Exposure Report
Chromium	California Water Body Pollutants 303 (c) & (d)
Copper	CDC 4th National Exposure Report
Copper	California Water Body Pollutants 303 (c) & (d)
Copper	OEHHA Reference Exposure Levels
Iron	California Water Body Pollutants 303(d)
Manganese	Agency for Toxic Substances and Disease Registry Neurotoxicants
Manganese	California Notification Levels
Manganese	California Toxic Air Contaminants
Manganese	CDC 4th National Exposure Report
Manganese	California Water Body Pollutants 303(d)
Manganese	Integrated Risk Information System Neurotoxicants
Manganese	OEHHA Reference Exposure Levels
Nickel	California Toxic Air Contaminants
Nickel	California Water Body Pollutants 303 (c) & (d)
Nickel	International Agency for Research on Cancer Carcinogens - 1
Nickel	National Toxicology Program 13th RoC - known
Nickel	OEHHA Reference Exposure Levels
Nickel	Proposition 65
Tin	CDC 4th National Exposure Report
Zinc	CDC 4th National Exposure Report
Zinc	California Water Body Pollutants 303 (c) & (d)