Features: 1.Made of high?quality plastic, compact and durable, safer than traditional high?speed stainless steel bearings. Take it with you, the thickness is only 20mm/0.8in, can be easily put in a pocket. 2.Decompression design, composed of eight small cubes, each cube can be rotated from any direction and angle. 3.Accuracy workmanship, each sub?cube is precisely processed and assembled to form a 40mm/1.6in cube. 4.The toy can bring endless fun, can improve concentration, and you can focus on the task at hand. 5.It will relieve your bad emotions during study or work, and it is a perfect gift for children, relatives and friends. specification:Item Type: Plastic Cube Material: Plastic Function: Improve concentration. This toy can bring endless fun, can improve concentration and make you focus on the task at hand; irritability during study or work will reduce your anxiety and stress, and enable you to concentrate on solving projects. Single Size: Rectangular Shape: Approx. 7.9x4x2cm/3.1x1.6x0.8in (Manual measurement, for reference only) Square Shape: Approx. 4x4x4cm/1.6x1.6x1.6in (Manual measurement, for reference only) PackageList:3 x Cubes NoteManual measurement, for reference only.