It's a standard 28" and 27" road, gravel, cyclocross and fitness tube with Presta 60mm length valve. STANDARD - doesn't mean ordinary: quality rubber compound combined with even wall thickness makes RFR tubes reliable and durable. RFR tubes were tested in laboratory!
For wider 28" and 27" road, gravel, fitness anc cyclocross tires
For tire width (ETRTO size in mm): from 28-622 to 32-622, as well as from 28-630 to 32-630
Valve type: Presta / SV
Valve length: 60 mm