28mm for most popular rotary cutters - Dafa, Emery, Olfa, Clover, Kai, Eastman, SewMate etc.  packed 2 pcs per blister card.

* Material of blades are high carbon steel SKS7 punched and hardness is up to RC 57 degree.
* Sharp blades along with durable edge.
* Two blades packed in a blister card.