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Pack of 12 Replacement Discs for Kilner Preserving Jars https://www.amazon.co.uk/dp/B0042FTT88/ref=cm_sw_r_cp_api_i_kknJFbQ883WGR
£7 for 12 in the U.K.!
£10.99 for the Ball ones.
Ball Wide Mouth Mason Jar,Canning Split-Type Lids and Bands,with Silicone Seals Rings Leake Proof Secure(10pcs/86mm/Lids+Bands) https://www.amazon.co.uk/dp/B08JGDRD9P/ref=cm_sw_r_cp_api_i_4lnJFbPCJZWTT