Jefferies Harmony Loop Ring Shaped similar to the NS Verbindend mouthpiece. £31.50 imperial size: [None]5"5.1/2"6"51/4"53/4" Quantity: at £31.50 each Add To Basket NEW FOR 2019. The shaped mouthpiece (similar to the NS Verbindend) is now available in a loop ring. Ergonomically designed. 90% Copper Mouthpiece to help promote salivation. The moutpiece has a more defined angle which allows more precise aids, but still allows a light contact to promote a softer but quicker response.