This shiny silvery Slime is part of Enix's Monster Museum lineup. It's about 1.5cm tall (not including the base), and is kind of oozing all over its base; a collector card is also included.
Please note that the photos shown are of a prototype; the production version may vary. Also, figures such as this are mass produced and as a result some inconsistencies in finish and painting may occur; these are not considered manufacturer's defects. If you absolutely must have perfection, prepare to do some touch-up work on your own.