This listing is for a PAIR of quality Impac Inner tubes by Schwalbe These will fit: 29" wheeled bikes running tyres from 1.50- 2.35 28" wheeled bikes running tyres from 1.50-2.35 27.5" wheeled bikes running tyres from 2.00 - 2.35 Standard 40mm long Schrader valve Reinforced dual thickness tube valve interface to prevent punctures Light weight butyl rubber construction Suitable replacement tube to fit the following tyre sizes: 27.5 x 2.00 (50-584) 27.5 x 2.35 (60-584) 700 x 38C (40-622) 29 x 1.75 (47-622) 29 x 2.00 (50-622) 29 x 2.10 (54-622) 29 x 2.25 (57-622) 29 x 2.35 (60-622) 700 x 38B (40-635) No need to wait around for the courier as they conveniently packed for FREE LETTERBOX DELIVERY!.