The solid center green piece (2021-3) and rockers (2021-3R1 to 2021-3R5) are for 6 hours of service each - 36 hours of service total.

The green solid piece (2021-4 - center and rocker all one unit) is for 50 hours of service.

The silver solid piece (2021-4) is for 75 hours of service.

The gold border piece (2021-5) is for 100 hours of service.