Continental standard weight presta valve tubes. Seamless and mold cured construction. Presta and Schrader have removable valve cores. Presta and Schrader valves are threaded full length. Weight: 350. Valve: Presta Med 41-55mm. ISO Diameter: 559 / 26" mtn. ISO Width: 58. ISO Width: 59. ISO Width: 60. ISO Width: 61. ISO Width: 62. ISO Width: 63. ISO Width: 64. ISO Width: 65. ISO Width: 66. ISO Width: 67. ISO Width: 68. Labeled Size: 26 x 2.3-2.7. Tube Compound: Butyl. Valve Core: Removable. Presta Shaft TYPE: Threaded.