MG Chemicals 812-50, Foam Over Cotton Swabs Single Headed, 50 Pack, Case of 5MG Chemicals 812 50, Foam Over Cotton Swabs Single Headed, 50 Pack, Case of 5 These polyurethane foam swabs are highly absorbent precision cleaning applicators featuring shred resistant 100% urethane foam heads with 100 PPI porosity over extra absorbent U. S. B. pharmaceutical grade purified cotton. Their heads are bonded securely to a 6 birch shaft, providing extra strength when additional pressure must be applied. Available in packs of 10, 50, 250