Qm-h Set of 5 Pieces 1x3x3 2x2x2 3x3x3 4x4x4 5x5x5 Stickerless Speed Magic Cube Puzzle Classical cube Eco-friendly, recyclable material product, harmless to human and environment For adults, it can release their pressure after work Set of 5 piecescubes, 1x3x3 2x2x2 is sticker cube, 3x3x3 4x4x4 5x5x5 is stickerless cube For kids, it can develop their brain and logic thinking ability 6 solid colored plastic sides that won&#39;t wear down, New structure design is drop-resistant and water-resistant