This is a Replacement Pair of Treadmill Doctor Walking Decks  Part Number 003-5312 for the Bowflex TreadClimber Model Numbers

Bowflex -
TC10 - 100198
TC10 - 100341
TC10 TreadClimber - 100360
TC100 TREADCLIMBER - 100456
TC5 Treadclimber - 100215 - 2013
TC5 TreadClimber - 100377

Nautilus Residential -
Mobia Treadclimber - 100183