These silicone tray mats/tray liners are used to prevent food from sticking to the trays. One can also use butcher paper if desired.
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Small sets include four mats/liners ($30)
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Medium sets include five mats/liners ($35)
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Large sets include six mats/liners ($49)
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X-Large sets include seven mats/liners ($80)
Note that the picture shows a liner placed inside a tray. The tray itself is not included.