Some life-size coffin props are battery-powered (several listings specify 3 AAA batteries and note batteries included in at least one item). Other models list no battery or power requirements and are non-powered.
Collapsible coffin props typically use a flexible spring-wire metal frame combined with PVC support tubes and pockets (some listings mention six tubes) to form and retain the coffin shape.
Manufacturers create a wood appearance either with printed wood-plank graphics on weather-resistant nylon or by applying a wood-look finish to foam or plastic surfaces.