FRIXION SYNERGY KNOCK 0.3mm refill, set of 3 colors: blue, red, and black. - Colors: Blue, Red, Black - Model Name: FRIXION SYNERGY KNOCK - Tip Size: 0.3mm - Quantity: 3 refills Thank you for viewing. I am selling these because I accidentally bought the wrong ones. I checked the contents of the box once, but they are unused. ○ Available for immediate purchase