It's a standard 26"/27.5" tube with Dunlop 40mm length valve. STANDARD - doesn't mean ordinary: quality rubber compound combined with even wall thickness makes ACID tubes reliable and durable. ACID tubes were tested in laboratory!
For 26" and 27.5" tires
For tire width (ETRTO size in mm): from 47-559 to 57-559 and from 47-584 to 57-584, as well as for 47-571
Valve type: Dunlop (DV)
Valve length: 40 mm
: 202 g