-- MESSAGE WITH SIZE REQUIRED.... MOST COMMON ARE 2B (STANDARD ) FOLLOWED BY 1B SMALLER) THEN LASTLY 3B (LONGER) --- The PAIR OF GENUINE GN Resound Surefit (SF2) Danalogic Hearing Aid Slim Thin Tubes are high-quality hearing aids designed for comfort and ease of use. Made by GN Hearing, these behind-the-ear devices are ideal for fitting both NHS and private aids. With a slim and thin design, they are easy to self-fit and offer a comfortable experience for the user. Manufactured in Denmark, these hearing aids provide reliable assistance for those in need of daily living aids for improved hearing. -- MESSAGE WITH SIZE REQUIRED.... MOST COMMON ARE 2B (STANDARD ) FOLLOWED BY 1B SMALLER) THEN LASTLY 3B (LONGER) --