The refill pack contains 2x 50 meters of silk floss. This compostable floss is made of natural silk, which has been used by humans for thousands of years for its incredible strength and softness. So, it is well suited for interdental cleaning. The floss refills are made of mulberry silk, candelilla wax and it has a refreshing peppermint touch. Materials The floss is made of Ahimsa silk which is a method of non-violent silk breeding and harvesting. This method allows the completion of the silkworm's transition to its moth stage. In contrast, most silk harvesting requires the silkworms to be killed in their cocoon stage. Silk is one of the strongest natural fibres. It is perfect for gliding between teeth without breaking. Afterwards, being 100% natural, the silk floss degrades easily in backyard compost. A vegetable wax extracted by boiling the plant. It is a non-gelling thickener and film former with protecting properties and making it the perfect wax to lubricate the floss and enable it to slide through teeth easily.