200ml Square Glass Jars

 

https://www.wilko.com/en-uk/wilko-12-pack-200ml-square-jars/p/0453105

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https://www.amazon.co.uk/Lakeland-Small-Square-Presentation-Gifting/dp/B00FGOUOFQ/ref=sr_1_29?dchild=1&keywords=square+glass+jars&qid=1596554728&sr=8-29 - (these are a little bit smaller which will require taking two edges off your cube to get it in)

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Mini Cubes

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https://www.amazon.co.uk/gp/product/B07B6L6QXL/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

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Dental Dam Sheets

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https://www.mrdental.co.uk/Dental-Instruments--Equipment/Rubber-Dam-Sheets.Html?cPath=