The Ring included in the Slate's essential kit comes with a S size adapter, compatible with drawing and writing tools of up to a diameter of 7,4 mm (0,29 inch). 

An additional pack of the Ring is available in our webstore. It contains 2 rings and 4 silicone adapters: 2 in S size and 2 in M size. The compatibility with your tools will be increased to a diamater of 8,1 mm.

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