What is the highest oven temperature that is safe for their use?

I used them in a 400 degree oven.

I would love to find a silicone baking mat bundle to match these. anyone out there know of anything?

I've spent a bit of time checking this out. Here is what I've found. https://smile.amazon.com/CHERAINTI-Grill-Mat-Non-Stick-Resistant/dp/B071RRCLMF/ref=sr_1_7?crid=GGI3ORHBVI76&dchild=1&keywords=cut+to+fit+silicone+baking+mat&qid=1600452989&sprefix=tcut+to+fit+silicone+baking+mat%2Caps%2C185&sr=8-7 , https://smile.amazon.com/dp/B016YC0YNA/?coliid=IVTOSWW1CEWHB&colid=SAWY98DGDM55&psc=1&ref_=lv_ov_lig_dp_it , It was easy to find mats to fit the two larger sheets. I couldn't find anything to fit the 7"x 9" pan

Per their paperwork these products are made in China,, also they don’t even mentioned anything about the material -they don’t have a business email address just a hotmail email -

ASIN	B07NNQ4G96
Best Sellers Rank	#27,917 in Kitchen ( See Top 100 in Kitchen ) #87 in Baking & Cookie Sheets
Brand	Wildone
Brand Name	Wildone
Color	Silver
Colour	Silver
Customer Reviews	4.5 out of 5 stars 5,443 Reviews
Included Components	Baking Sheet, cooling rack
Is the item dishwasher safe?	Yes
Item Dimensions L x W x H	40.6L x 31.1W x 2.5H centimeters
Item Weight	2 Kilograms
Item weight	2 Kilograms
Manufacturer	Wildone
Material	Stainless Steel
Material Type	Stainless Steel
Material Type Free	Chemical Free
Product dimensions	40.6L x 31.1W x 2.5H centimeters
Size	16 /12 /9 inch
UPC	700401774943

Wildone Baking Sheet with Rack Set (3 Pans + 3 Racks), Stainless Steel Baking Pan Cookie Sheet with Cooling Rack, Non Toxic & Heavy Duty & Easy Clean

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