• Mineral stone digging :this set of is made of , which is safe for to play,mineral stone specimens
• educational :and of , safe and for to play, DIY digging
• Stone digging :can be used as parent- interactive , your relationship,natural stone
• Educational digging :cultivate hands-on ability and hand-eye coordination ability,stone collection
• digging :with these stones, can share them with their playmates and play together, excavating