MG Chemicals 813-250, Foam Swabs, Single Sided, 250 Pack, Case of 1MG Chemicals 813 250, Foam Swabs, Single Sided, 250 Pack, Case of 1 A durable precision cleaning applicator with a shred resistant 100% urethane foam head with 100PPI porosity. Bonded securely to a birch shaft providing extra strength when additional pressure must be applied. Available in packs of 10, 50, 250 and 1000. Features & Benefits Pharmaceutical grade purified cotton General cleaning swab Used in electronic assembly and medical device