Note: The Baseistransparent. Itcomeswithkraftpaperonthesurface, thatswhyitlooksyellow. Product description: This is a real solar magnetic levitation motor model, pure handmade, composed of 6 solar silicon wafer, copper coils, shaft, Nd Fe B magnet, acrylic stent. Can save energy in incandescent light, solar light, the light, rotating in the suspended state, the maximum can reach one thousand rpm is interesting, choose your gift, the practice of science, scientific theory to explain & home furnishings! Specification: 3.8 (High) X 4 (Diameter) Matters needing attention:A: magnet attraction is very strong, the assembly of the attention, clamps the h&.B: the top end of the rotary shaft part can not be forced into sharp collision, damage will result in equipment failure.C: because it is pure handmade, part of the fixed use glass glue, tape, easily damaged, please avoid excessive force.D: in most cases, this means you need to manually add external rotation, the rest can give light to complete. Note:1. Therealcoloroftheitemmaybeslightlydifferentfromthepicturesshownonwebsitecausedbymanyfactorssuchasbrightnessofyourmonitorandlightbrightness.2. Pleaseallowslightdeviationforthemeasurementdata.3. Pleaseallow 1cm-2cmerrorduetothehandmeasurement.