OLFA 9mm Black Spare Blade BB50K. Blade width (mm) 9. Blade thickness (mm) 0.38. Blade length (mm) 80. Mass (g) 117.6. Material (blade) Alloy tool steel. OLFA 9mm Spare Black Blade BB-50K (ABB-50) 50 Blades per Pack × 20 piece set. Model Number : BB-50K (equivalent to ABB-50). International Buyers – Please Note. For Buyers in the United States. For Buyers Outside the United States. These charges are the responsibility of the purchaser. We do not mark merchandise values below value or mark items as “gifts” US and International government. Regulations prohibit such behavior. Thank you for your understanding.