Following lab testing and a case study, String Swing stated that its products are under the acceptable threshold and there is no risk of cancer or reproductive harm from using its products. Hence, String Swing is in the process of removing warning labels from its product packaging, which is required for certain products under California’s Proposition 65, which went into effect on Aug. 30. String Swing had been labeling its products as a precautionary measure, as they contained small amounts of some of the listed chemicals in the raw materials.

California Proposition 65 requires prominent warning messages for products that can expose Californians to certain chemical hazards identified under the Safe Drinking Water and Toxic Enforcement Act. This Proposition 65 chemical warning sign is designed to meet current California standards.

The label states: “This product can expose you to chemicals including Methyl Isobutyl Ketone (MIBK), which is known to the State of California to cause birth defects or other reproductive harm. For more information, go to”

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