These stones are especially helpful in the teaching sample collections. Natural ore stones, can be used for school teaching and personal collection, durable and practical. You could send it to your friends and kids as gift and they will be very happy and definitely love it. Features - - Material: Plastic, stone. - Size: 14.50X11.50X2.50 cm/5.70X4.52X0.98 inch. - Excellent selected natural material, delicate and beautiful for personal collection. - and attractive stones, with natural shape and color, deserve to be collected and decorated. - Useful teaching ore stone samples for teachers to let kids know more about mineral stones. - Nice gift for mineral enthusiasts, geography teaching and collectors, simple and unique. - The shape of the stone is different from each other, and natural to display and show. Package list: 1 set x stone samples