According to Horizon
http://www.horizonhobby.com/Products...115#quickSpecs the Saito 115 Benchmark Prop is APC 15 x 6 @ 8800 rpm. Their manuals explain that the Benchmark is determined using fuel with 15% nitro. Total advertised weight is 23.5 ounces.
Hobby People
http://www.hobbypeople.net/gallery/210879.asp says the Magnum 120 weighs 31 ounces and does not have prop or rpm info.