Product review (4 stars): although it is annoying and ridiculous that it has to be purchased separately
It is exactly what it is supposed to be, although it is annoying and ridiculous that it has to be purchased separately. Someone complained that he placed the bumper strips on top of the washer, underneath the dryer's feet, and that doing so made the dryer more prone to slipping, but that's because that's not what they're for. The bumper strips go along the back edges of the washer (or the sides) so that it doesn't ruin paint if it is up against a wall (that's what the instructions say). I installed these as the instructions provide and the dryer is rock-solid on top of the washer, even when the thing looks like it's having conniptions during a super-heavy cycle.