The Thames & Kosmos Rock Tumbler Essential STEM Tool | Durable, Leak-Proof, Noise-Reducing Barrel, Built-in Timer | Polish & Shine Kids Rock Collections, Includes Authentic Specimens & Polishing Grits

USER-FRIENDLY: Budding geologists can easily transform rough stones into smooth, beautifully polished rocks!

CUSTOM DESIGNED: The powerful, long-lasting motor is highly durable and the leak-proof, noise-reducing barrel aids in ease of use. Also includes a built-in timer with various settings, allowing the tumbler to run for up to seven days!

ASSORTED SPECIMENS INCLUDED: Kids ages 8 & up can start with the genuine rock samples that come with the kit -- including amethyst, aventurine, rose quartz, and more -- as well as four polishing grits. Then move on to other rocks, glass, wood, or other mateirals you collect on your own!

EDUCATIONAL VALUE: Explore the secrets of geology, diving into topics like erosion, weathering, and the geological rock cycle as you amp up your rock collection, guided by the included manual and poster.

BONUS SPECS & EXTRAS: Includes jewelry fasteners to transform your rocks into accessories. The rock tumbler has a 450g capacity (over 1 pound) and a USB-C power supply