2 x Schwalbe Inner Tubes - 20" x 2.1 - 3.0 HEAVY DUTY (54/75-406) - Auto/Schrader Valve - PAIR - FREE SHIPPING! FREE VALVE CAP UPGRADE WORTH $4.99! [No. AV7D ] TWIN PACK - 2 x Premium quality Schwalbe inner tubes direct PUNCTURE RESISTANCE - Higher quality butyl rubber gives better protection SUPER AIR TIGHT - Less requirement to re-inflate unlike other tubes SKYSCAPE METAL VALVE CAPS - 3x Higher air retention over plastic caps - Worth $4.99 IN STOCK + FREE P&P - Ready to ship now!