Dryer drum belt, length 88.75" x width 1/4". If the drum does not turn, but you can hear the motor running then there is a good chance the belt has broken.
Dryer drum drive belt, 5 rib
Dryer drum drive belt. 87 3/4 inches long and 1/2 inch wide. This drive belt wraps all the way around the dryer drum, around a tension pulley, and then around the drive motor pulley. If this belt is cracked or broken, the dryer drum will not turn.
Belt length 87 3/8”, width 1/4”, characteristics, 4 ridges, flat
Dryer belt, length 89”, width 3/8”, characteristics, 4 ridges, flat
Brum drive belt
Belt length 90 1/8”, width 3/8”, characteristics, 4 ridges, flat