Is there any warning associated with the Lorell Bistro Stack Chairs regarding safety?

Yes, there is a California Prop 65 warning indicating the product may expose you to chemicals that can cause cancer and reproductive harm.

What material is used for the seat of the Lorell Bistro Stack Chairs?

The seat of the Lorell Bistro Stack Chairs is made of plastic.

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Lorell Heavy-duty Bistro Stack Chairs - Black Plastic Seat - Black Plastic...

SKU:BG1783195
Unit of measure:CT
Color:As Shown in Picture
Material:Plastic
California Prop 65 Warning:WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. 2-Mercaptobenzothiazole,BPA,Ehylbenzenze,Styrene