Builder's Cutting Mat 305mm x 455mm (12" x 18") from Excel - 60003
These non-slip cutting mats are perfect for protecting your bench or work top when working on various home or RC projects.  The mats are firm and can withstand any normal cutting job you can throw at it.  The mats are reversible and "self-closing" to keep them looking new longer.
Features:

Thick, Three-Layer Construction Helps Extend Knife Blade Life
Very Firm Surface Withstands Most Cutting Tasks
Standard and Metric Rulers on Two Edges, Angle Guides and Star Templates
Reversible and Self-Closing to Extend Life of Product

Specifications:

Dimensions: 305mm x 455mm (12" x 18")