Olfa KB4-S/25 Blade SKU: TTB101002 PricingQuantityPrice $5.32 Quantity -+ Add to Cart Description Replacement Blades KB/25 for the Ofla Art Knife AK-1/5B and ... DescriptionBackReplacement Blades KB/25 for the Ofla Art Knife AK-1/5B and the Ofla AK-4 Art Knife. Sold in a pack of 25 blades.