Home > Science & STEM Kits > Essential STEM Tools: Rock Tumbler Refill

Essential STEM Tools: Rock Tumbler Refill

STEM
Earth Science
Ages 8+

Restock your rock tumbler with fresh supplies.

$14.95

Keep on rockin' and rollin'! This refill pack for the Thames & Kosmos Rock Tumbler includes a full one-pound assortment of natural rock samples — tiger's eye, aventurine, rose quartz, and more — plus four polishing grits to keep your tumbling adventures going. Use the included jewelry settings to turn your newly polished specimens into wearable accessories.

What's in the Box

Piece Count: 10

Deeper Dive

Keep on rockin’ and rollin’ with this refill pack for the Thames & Kosmos Rock Tumbler. This pack includes a one-pound assortment of natural rock samples — including tiger’s eye, aventurine, rose quartz, and more — as well as four polishing grits. Use the included jewelry settings to create accessories from your specimens.

Ages

8+

Piece Count

10

Product Dimensions

4.5 x 9.6 x 2 in.

Product Weight

1.3 lbs.

Batteries Required

N/A

Country of Origin

China

Year Released

2025

Reviews

Straight from real parents

We envision a world where everyone loves to learn.

Our products inspire kids and families to think deeper, play longer, and figure stuff out.

Heritage Fuels Discovery

With 200+ years of science publishing behind us, we've helped shape the STEM category worldwide. That heritage guides every product decision, from content development to quality standards.
Curiosity, Engineered

We solve engineering problems most toy companies wouldn't attempt. GeckoBot climbs glass, Gecko Run builds marble runs on walls, and the Mega Cyborg Hand, a wearable hydraulic exoskeleton, was the #1-selling science toy in the US in 2025 (Circana).

Curiosity, Engineered

We solve engineering problems most toy companies wouldn't attempt. GeckoBot climbs glass, Gecko Run builds marble runs on walls, and the Mega Cyborg Hand, a wearable hydraulic exoskeleton, was the #1-selling science toy in the US in 2025 (Circana).
Everyone's a Scientist

We turn complex science and technology into fun, hands-on experiences for kids and families. From crystal growing to advanced robotics, we make the challenging feel approachable and the approachable feel exciting.

Everyone's a Scientist

We turn complex science and technology into fun, hands-on experiences for kids and families. From crystal growing to advanced robotics, we make the challenging feel approachable and the approachable feel exciting.

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Essential STEM Tools: Rock Tumbler Refill

What's in the Box

Deeper Dive

Straight from real parents

We envision a world where everyone loves to learn.

Heritage Fuels Discovery

Heritage Fuels Discovery

Curiosity, Engineered

Curiosity, Engineered

Everyone's a Scientist

Everyone's a Scientist

Ages

Science

Board Games

Play & Crafts

For Educators

Robotics

Essential STEM Tools: Rock Tumbler Refill

What's in the Box

Deeper Dive

Straight from real parents

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Heritage Fuels Discovery

Curiosity, Engineered

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