Impac is produced by Schwalbe, These Impac inner tubes are made from high quality butyl material, butyl is an elastic and airtight synthetic rubber. All Impac inner tubes are 100% recyclable and are produced using 20% recycled old tubes. 
The valve prevents punctures as it is reinforced with dual thickness.
 
Does this inner tube fit my wheel ?
This inner tube fits the tyre sizes listed below,
26 x 1.50  (40-559)
26 x 1.75  (47-559)
26 x 2.00  (50-559)
26 x 2.10  (54-559)
26 x 2.25  (57-559)
26 x 2.35  (60-559)