Medela Breast Pump Tubing Set, 1 Case of 10 Compression Sleeves Socks Each roll comes in an 4012SC Each roll comes in an easy to open vacuum sealed pouch to preserve moisture * Size based on pre pregnancy dress sizes * Offers relief from back discomfort during pregnancy * 8 elastic pregnancy belt supports the lower abdomen while the duo adjustable elastic side tension offers additional support * Provides temporary stabilization of the pelvis * Measurement is dress size before pregnancy: 12 20 dress size * Latex Free * Great as a spare part or to replace a worn or damaged tube Authentic Medela replacement tubing makes it easy to ensure optimal performance for your breast pump