It is a rubber magnet for synthesizers. This is a set of 4 types. This is a great set for those who are not sure which type to get! Since the price is usually for 3 bottles, 1 bottle is free and it is a good deal. The dot pattern design has a three-dimensional effect unique to rubber. It's a cute magnet. Office desks, lockers and whiteboards Decorate it in a steel place such as a refrigerator. It might be ♪ a good gift for synth lovers < Synth Rubber Magnet Set of 4 > Contents Synth rubber keychain 1 each 01：FM SYNTHESIZER 02：ANALOG SYNTHESIZER 03：ANALOG SYNTHESIZER 04：PCM SYNTHESIZER <Synth rubber magnet specification> Body: PVC, Neodymium Magnet Body size: Approx. 41×19×5.5mm (including magnet) * The cross-section may be distorted during the rubber cutting process. Please note that this is a characteristic of the material.