Clever Choice ComfortEZ Pen Needles 33G 4mm 100/bx fits all pens, is for people of all sizes, has easy injection at all sites, and is more comfortable. Clever Choice ComfortEZ Pen Needles are compatible with all insulin pens sold in the United States. Features: Coated with special lubrication for a more comfortable injection Subject to 100% needle point inspection to assure consistent high quality Non-toxic, non-pyrogenic and latex free Less thumb button pressure makes it easier to use Aids in overall injection comfort