● Nasco packages its bulk Rock and Mineral Specimens in both 1-kg packages and packages of ten 3 cm x 4 cm specimens. ● This enables you to order specimens by weight for large projects or in presized specimens ready for lab and students identification. ● The picture represents one sample from both the large 1-kg package and the small bag of 10 (3 cm x 4 cm specimens). ● Actual size may vary.