What's the size of each key

[CS-liujf]

The workloada says

# Yahoo! Cloud System Benchmark
# Workload A: Update heavy workload
#   Application example: Session store recording recent actions
#                        
#   Read/update ratio: 50/50
#   Default data size: 1 KB records (10 fields, 100 bytes each, plus key)
#   Request distribution: zipfian

If I use ycsb to test a kv store like rocksdb, I am curious about the size of each key. Besides, what‘s the size of each value, 1KB?