OLFA 45mm Rotary Cutter Replacement Blades, 5 Blades (RB45-5) - Tungsten Steel Circular Rotary Fabric Cutter Blade for Quilting, Sewing, Crafts, and Scrapbooking Fits Most 45mm Rotary Cutters

from semi transparent packaging - the hole looks just to be round but when you open you see it is the right shape as shown think I could have used round hole ones - but this shape was on my board from someone using on an old dark gray Fiskar board with an orange guard and orange grid - seems to work fine

I have now tried 2 out of the 5 blades and both of them have places that do not always cut. Most of the time I have to go back over those spots. The whole idea of putting in a new blade is to get a clean cut first time. Its not like Im cutting multiple layers or anything difficult. This happens when trying to cut a single layer of quilters cotton

At the price I can blades for frequently

Ive bought off market brands for my Olfa - never again. Olfa brand is all I will use! Off brand doesnt last as long or cut as well.

Olfa brand is dependable

Same price as store but they’ve been out for weeks.

EDIT 2/5/17: With 3 of the 5 blades in the pack unused, I finally gave up. During a recent visit to my local quilt shop, I purchased a pack of ten Olfa blades (not cheap at $59.95, but much better than throwing my money away on these worthless blades). As soon as I put one of the NEW blades on and cut some pinwheel squares I was trimming, I could tell the difference. The blades I purchased locally cut like a hot knife through butter. With these blades that I had purchased here on Amazon, I would have had to SAW through the seamed sections to get them trimmed. There is NO comparison. These are NOT Olfa blades. Or, at least, they are not the same Olfa blades that I get locally. There is something wrong with them - either they are use and re-sharpened (as others have implied) or they are a knock off of the real deal. Save yourself the money and the headache. I learned the hard way. Never again!! ----- ORIGINAL REVIEW: These may look just like Olfa blades (even though the entire package is printed in Japanese), and for the first few days that you use them they perform like Olfa blades, but thats where the similarity ends. Olfa blades that I purchase locally will last me a LONG time. They cut through multiple layers of fabric - often heavy fabric, too. Im on my second blade of this pack, and both of them are the same: they work for about a week, but then theyre dull, even having difficulty cutting through a single layer of Kona Cotton fabric. Annoying! Ive replaced a blade every 4 or 5 weeks. Unacceptable! Blades should last a whole lot longer than that. My locally purchased Olfa blade lasted nearly a year! I would not purchase these again, because clearly I was penny-wise and pound-foolish when purchasing these blades. Theyre not worth it. Pay the money and buy the real ones, unless you like re-cutting your fabric over and over and over . . .

I like the blades and use them for quilting. They work well for me and seem to be better than other brands.

So much sharper than Fiskars blades! Good value.

Ive purchased cheaper blades from Amazon-- blades that bent or dulled after the first few minutes of cutting. Lets be honest, people buy a rotary cutter when theyre serious about cutting fabric. OLFA blades can go the distance. They dont bend or dull after the first pass. Ive had success using the same blade on multiple projects. Worth it.