This is the C4 Indian Black Replacement Blades PAIR for 300 Foot Pockets Features: MATERIAL: 100% carbon fiber T700 SUPERFORCE BLADE DIMENSION: 786 x 190 mm BLADE HARDNESS: 25 soft - 30 medium - 40 hard WATER RAILS: Constant h10mm FINS ANGLE: 29°blade + 3°footpoket = 32° FINS WEIGHT: from 600gr. up to 730 gr. FOOT POCKET WEIGHT: 316 gr. in size 40/41 C4 Indian Black Replacement Blades PAIR ONLY, 300 FOOTPOCKET Not included C4 has over thirty years experience in designing and manufacturing advanced carbon fiber equipment, in Italy