Dimensions: Inside Diameter (Actual): 1.636" Caps (Inside Depth): 1 1/2" Thickness: .022" Material: PETG (Polyethylene Terephthalate Glycol) Recycling: Tubes are recyclable, caps are not. Usage: Tubes open on both ends. Caps: Do not use with paper mailing tubes. Specifications: Acid free and archival safe. Not FDA compliant for food contact. Non-Latex Country of Origin: USA