TEC Accessories PicoPen Stainless Steel Pen w/Attachment Rings. Stainless construction. D1 ink cartridge refill (included). Cap contains neodymium rare Earth magnet to provide cap attachment security. Comes with 12mm split ring and snap ring for quick attachment and removal. Foam lined case. Bulk packed. Specifications for TEC Accessories PicoPen Stainless Steel Pen Tactical Pens: Manufacturer: TEC Accessories Overall Length: 3.25 in Blade Material: Steel Package Contents: TEC Accessories PicoPen Stainless Steel Pen Tactical Pens TEC Accessories PP003G-C: PicoPen Stainless Steel Pen w/Attachment Rings