Schneider Topball 850 Rollerball Refill, Blue, Box of 10 Refills (8503) Schneider is a leading international brand, with writing instruments designed and engineered in Germany, distributed in the US exclusively by Stride, Inc. European size rollerball refill - fits many refillable rollerball pens 0.5mm writing point, conical shaped nib; Box of ten refills; blue ink Wear-resistant stainless steel tip for durability Long lasting ink supply - writes for over 1/2 mile