7mm tall oils seals for 35mm forks.
Each seal has a double lipped sealing profile, one sealing surface acts as an oil seal to keep oil in, the sealing surface acts as a wiper seal to keep muck out. Twice the sealing!
7mm tall seals are typically fitted two per leg.
You are buying two seals.
If you want to service both legs you will amend the quantity to two, in which case you will receive 4 seals.