I have one pair of C4 Falcon 80 carbon freediving fins for sale.They currently have tecknosport footpockets size 43-45 on them, but these are easily changed.They are in excellent condition are are hardly used.These fins are specifically for freediving as they are quite long.Check out C4"s web site www.C4carbon.com for more details.These fins sell NEW, for £221.23 plus £33 for the foot pockets.Check out www.scuba-equipment-europe.com & you will see.I want £180 for mine.you can e mail me on nemo2965@aol.com & I will e mail you pictures.These are the rolls Royce of freediving fins.