Fine quality, durable triangles made of see-thru polystyrene, .080 inch thick. Convenient lift for repositioning.Includes:One 30/60 Degree Triangle Shipping Details Shipping Type: parcel Free Shipping: true Specifications Maximum Grade Level: Grade 12 UPC: 088359006973 Allergens: Contains No Allergens Certifications: Not Applicable Grade Level: Middle-High School SUOM Description: Each Brand Name: Westcott Description: Polystyrene Triangle, 30/60 Material: Polystyrene Size: 10 in Material Type: Polystyrene