PineCar flat and plate weights fit in the cavity. There are extra grooves for optional extended wheel base. 
Pre-Cut measures approximately 1 3/4" w x 7" l (4.44 cm x 17.7 cm)
Used with permission, Copyright 2020 PineCar/Woodland Scenics. Copyright 2020 Brey Corp. t/a Hobby Works.
$6 Flat Rate Shipping. FREE Over $199* Most Orders