Silicone Pastry Mat
Silicone Pastry Mat
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 NORPRO Silicone Pastry Mat With Measurements NEW  US $11.37
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 New Silicone Baking Pastry Mat Kitchen - Pink Bakeware US $5.99
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 New Silicone Baking Pastry Mat Kitchen - Orange US $5.99
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 Massive Pastry Fondant Silicone Work Rolling Mat(smaill size) US $12.58
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 New Silicone Baking Pastry Mat Kitchen - Dark Red US $5.99
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 Large Baking Pastry Mat Sheet Silicone Bakeware US $8.99
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 Sunflowers Patterns SILICONE ROLLING MAT FOR FONDANT/SUGARCRAFT/ICING/PASTRY US $19.99
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 Sharp Star Patterns SILICONE ROLLING MAT FOR FONDANT/SUGARCRAFT /ICING/PASTRY/DO US $18.99
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can I use a knife to cut on a silicone pastry mat?
as these? or will it scratch the material?
http://www.tescoma.com/en/katalog/xpoloz.php?skupina0=4&skupina=4&skupina2=1&polozka=629380
Yes you can 
And if your knife/knives are sharp the the mat will get cut. I've had harder flexible plastic mats completely destroyed by sharp knives, which is normal.
If you have at least half decent knife, don't use it on glass/marble surfaces.It'll destroy the knife edge. If those are throw away pieces then whatever you wish.
Anyway, those mats aren't intended for cutting and won't hold up that well. Besides, small surface cuts on them will harbor bacteria. That is very hard to scrub out, pretty much impossible.
Better choice is hard rubber cutting boards. Those are dishwasher safe, friendly to your knives edges and FDC approved. Most of the restaurants use those instead of wood boards these days. I still prefer good a wooden cutting board, less sticky and saves the sharp edges better, although I have both types.
Food tends to stick to hard rubber more than to the wood surface, on the other hand hard rubber is cheaper, dishwasher safe, lighter and thinner, compared to end-grain wood boards.