It is a rubber keychain of rhythm machine type. It is finished in a cute key chain with a dot pattern design. The three-dimensional feeling peculiar to rubber is a good feeling. This is a set of 4 types. It's a great set for the direction you're wondering which type to get! Since the price is usually for 3 bottles, 1 bottle is free and it is a good deal. Your favorite bag or lesson bag, You may want to attach it to your instrument case. It might be ♪ a good gift < Rhythm Machine Rubber Keychain Assortment Set of 4 > Contents Rubber keychain 1 each 01：Analog RhythmMachine 808 02：PCM-Analog RhythmMachine 909 03：Bass SYNTHESIZER 303 04：PCM RhythmMachine　　 < Rhythm Machine Rubber Keychain Specification> Body: PVC Plug parts: Steel, Nascan type Body size: Approx. 45×23×5mm (excluding key chain) * The cross-section may be distorted during rubber processing. Please note that this is a characteristic of the material.