u.s. art supply 12" x 18" Self-Healing Cutting Mat 5-Ply Double-Sided Green/Black Craft Mat

Walmart

Green mat color matches exactly, White grid lines match, Grid pattern with straight and diagonal lines (45, 60 degrees) matches, Rectangular form factor matches, Material appearance is consistent, Common craft mat size is plausible for the video frame, High priority retailer (Walmart.com)

Toolusa Self-Healing Cutting Mat CR-91218

ToolUSA

Exact green color, Exact white grid lines, Consistent angle markings, General design and form factor, Plausible size (12" x 18"), Self-healing material (implied)

Hawk Cutting Mat MAT-1824

ToolUSA

Green mat color matches exactly, White grid lines match, Grid pattern with straight and diagonal lines matches, Rectangular form factor matches, Material appearance is consistent, Plausible size for the video frame