Tapping block tool, used to install plank flooring (LVP / Luxury Vinyl Plank, laminate, etc.) tight without causing damage. Meant to be used with a rubber mallet or dead blow hammer. Based on a similar product available at various big-box stores.

Upping the infill can result in a more satisfying tool mass, though low-infill versions will hold up fine as long as proper hammer etiquette is followed (tap, don't smash!)