Blue Marble NATIONAL GEOGRAPHIC Hobby Rock Tumbler Kit - Complete Rock Tumbler Kit with Durable Tumbler, Rocks, Grit, and Patented GemFoam Finishing Foam Polish, Educational Stem Science Kit

cadeau de noel pour mes parents qui aime faire des bijoux fantaisies. il me dise que le procédé est long mais que le résultat est bon. les pierres qu'ils ont ramassé eux même on perdu 50% de leur taille.

It is incredibly loud. There is no place in my house that I can run this overnight. I live in Canada, cannot leave water in unheated shed. There is enough abrasive material for one tumbling cycle. The cycles take 3 - 6 days each. Many of the included rocks are so small, they are unusable after the 2nd or 3rd cycle. This product could be better. It does exactly as intended. My son is more knowledgable since we purchased this product.

Es wird als Spielzeug verkauft, ist aber robust genug, um längere Laufzeiten zu verkraften. Ergebnisse liegen noch nicht vor, da die Maschine viele Tage laufen muss.

This is a great introductory rock polisher and does an excellent job. The manual could include more tips on practical rock polishing. The supplied rock mix contains various types of rocks that in some cases should not be polished together as the softer rocks are destroyed by the harder rocks. That being said it is part of the learning experience. Please note the machine is noisy and may need a sound proof box unless you have a shed some distance from your home.

Mi hija se li ha pasado genial puliendo piedras