National Geographic Rock Tumbler Kit - Hobby Edition, Rock Polishing Machine Kit for STEM Learning, Includes 4 Grit Abrasive and Rock Collection, Fun for Kids and Adults, 1111 Regular Price: ¥13,500 Brand: Blue Marble Target Age: Children Product Dimensions (L x W x H): 35.2 x 20.5 x 12.5 cm Item Weight: 2220 grams Sub-brand: National Geographic About this product Make your own gemstones! - Turn ordinary stones into sparkling gems! This fun kit uses simple operation and a sturdy design to transform rough stones into beautiful gems. A durable tumbler that lasts! - The motor is designed for long life, and the leak-resistant rubber material provides excellent quietness. Perfect for children's STEM learning. A full-fledged polishing kit is included! - Includes a tumbler, 4 types of abrasives, a sieve, 9 types of real rough stones, and a color guide, making it a perfect gift for boys and girls! Easy operation for fun polishing! - Features a one-touch timer and automatic shut-off function, making it easy to set the number of days. Perfect as a gift for children! AWARD-WINNING PRODUCTS - Blue Marble has a track record of winning the Toy of the Year award and develops products that foster imagination and creativity. A US support team is available. #1118-06 #Christmas