24x35 Smooth Black/Black Custom Mat for 20x31 Opening - Clean Display

In this review the 24x35 Smooth Black / Black Custom Mat is assessed for photographers, framers, and anyone who needs a clean, archival mat for a 20x31 photo. The bottom line: this is a straightforward, professional-grade mat made from standard 4 ply material used in custom frame shops, and it delivers a stable, neutral mount that looks professionally finished. It is best for people who want a ready-made mat that fits a 24x35 frame and a 20x31 photo without fuss, and the option for custom cutting if the exact opening needs adjusting.

Key Features

• Standard 4 ply material: Provides the same thickness and rigidity framers expect, so the mat sits flat and resists warping in a frame.
• Lignin-free, pH-neutral: Protects photographs and printed work from acid damage over time, preserving color and paper integrity.
• Fits 24x35 frames: Sized to drop into a 24x35 frame, making it convenient for common large-format framing projects.
• 20x31 photo fit with actual opening: Designed to hold a 20x31 photo with a finished opening of 19.75 x 30.75 in, which helps hide edges and allow for overlap.
• Custom opening available: The manufacturer will produce custom cuts on request, useful when precise centering or nonstandard sizing is required.

Who It's For

This mat is aimed at hobbyist and professional framers who need a reliable, archival-quality mat that matches workshop standards. Photographers and artists preparing pieces for display in a 24x35 frame will appreciate the clean black surface and the predictable thickness of the 4 ply material.

It is less suitable for someone who needs ornate or decorative mat boarding or who requires a frame included in the purchase. Buyers who need extremely precise or unconventional openings should request a custom cut rather than relying on the stock opening dimensions.

Pros & Cons

Pros

• High-quality 4 ply construction gives a professional look and stable mounting.
• Archival, lignin-free and pH-neutral composition protects artwork over time.
• Fits standard 24x35 frames and is tailored for a 20x31 photo with a controlled overlap.
• Custom opening sizes are available on request for precise projects.

Cons

• Some buyers report slight size variation, so marginal trimming or custom cutting may be necessary.

Specifications

Product	24x35 Smooth Black / Black Custom Mat (mat only)
Material	Standard 4 ply mat board
Archival	Lignin-free and pH-neutral
Frame fit	Fits into a 24x35 frame
Photo fit	Fits a 20x31 photo
Actual opening	19.75 x 30.75 in
Custom options	Custom opening sizes available upon request

Our Verdict

The 24x35 Smooth Black / Black Custom Mat is a dependable choice for anyone mounting a 20x31 photo in a 24x35 frame, offering archival safety and professional build quality. It represents good value for framers and photographers who need a durable, neutral mat and the option of custom cuts when exact dimensions matter.

Frequently Asked Questions

Will this mat include a frame?
No. This listing is for the mat only; the frame is not included.

What are the actual opening dimensions?
The finished opening measures approximately 19.75 x 30.75 in to allow for edge overlap of a 20x31 photo.

Can I request a different opening size?
Yes. Custom opening sizes are available upon request if you need a more precise cut.