Aero Classic Inner Tube Size: 10x3.50-4 (410x350-4 & 4.00-4) or 10​/​350-4 TR 87 Overview Leakguard® Inner Tubes proprietary rubber compound substantially reduces the air seepage effect that is common in standard aircraft tubes currently available. Tested to MIL-I-5014F Supplier to USA Military & Foreign Armed Forces Valve: TR-87 Angle Degree: 90