◆ ball diameter: 0. 7 mm ◆ compatible products from other companies / Dragonfly: BR-NF NFL, pilot:BPRF-6F, Mitsubishi pencil: SA-7 Shaft: stainless steel: PP nib Adaptive products: ?Ballpoint pen BK70 & BK407? ". E ball 0. 7 [fine]. How to order in shopping cart