All 32 oz. pre-labeled Mothers Spray Bottles are OSHA compliant, meaning they meet the government's guidelines for occupational safety. The heavy duty bottles are pre-labeled with the names of popular Mothers professional products that require dilution. The color-coded and obviously labeled bottles prevent cross-contamination of auto surfaces and detailing tools. If you've ever grabbed engine degreaser thinking it was glass cleaner, you'll appreciate these clearly marked bottles!