This is for an incomplete set of K tubes in a little Nikon pouch. The set comprises of K2,3,4 & 5 allowing for the following combinations: K3 + K2 = 10.8mm extension K3 + K4 + K2 = 20.8mm extension K3 + K5 + K2 = 30.8mm extension K3 + K4 + K5 + K2 = 40.8mm extension The K1 ring is not included because I'm keeping it! It's the only one I use. As this set is incomplete, I'm asking a low price for it. I'd like to get £15 for this. Paypal is good and I'll post them anywhere.