: 10 gp Weight
: 1 lbDescription
: As a standard action, you can drop these smooth metal spheres into an adjacent square (or gather them back up). Any creature moving on the ball bearings must either treat the square as difficult terrain or succeed on a saving throw to avoid falling prone. Creatures that are running can use only the latter option.
Published in Mordenkainen's Magnificent Emporium, page(s) 124.