Newbold's KnockDown Self-Healing Reactive Target and the KnockDown Base it mounts on are each sold separately. When mounted on the KnockDown Base and hit, this KnockDown Target reacts and falls over backwards. It stays down until you reset it manually or by pulling on a string. Bullets pass through the KnockDown target and the KnockDown Base because they are both made of Throom™, our tough, flexible, self-healing polymer. To mount a KnockDown target on its KnockDown Base, you simply snap it into place. Then secure the KnockDown Base to your soft wood target stand with (4) wood screws or with (2) Throom™ Nuts & Bolts. For a different experience with the KnockDown Series Targets, mount the KnockDown Base upside down for swinging action and automatic reset or remove the target from the KnockDown Base and hang from a wire.