S-type asteroids are of a stony composition, hence the name. Approximately 17% of asteroids are of this type, making it the second most common after the C-type.

S-types are moderately bright (with an albedo of 0.10 to 0.22) and consist mainly of iron- and magnesium-silicates. They are dominant in the inner asteroid belt within 2.2 AU, common in the central belt within about 3 AU, but become rare farther out. The largest is 15 Eunomia (about 330 km wide across its longest dimension), with the next largest members by diameter being 3 Juno, 29 Amphitrite, 532 Herculina and 7 Iris. These largest S-types are visible in 10x50 binoculars at most oppositions; the brightest, 7 Iris, can occasionally become brighter than +7.0, which is a higher magnitude than any asteroid except the unusually reflective 4 Vesta.

Their spectrum has a moderately steep slope at wavelengths shorter than 0.7 µm, and has moderate to weak absorption features around 1 µm and 2 µm. The 1 µm absorption is indicative of the presence of silicates (stony minerals). Often there is also a broad but shallow absorption feature centered near 0.63 µm. The composition of these asteroids is similar to a variety of stony meteorites which share similar spectral characteristics.

Royce Gracie (Portuguese: [ˈʁɔjsi ˈɡɾejsi], English: /ˈrɔɪs ˈgreɪsiː/; born December 12, 1966) is a Brazilian professional mixed martial artist, a UFC Hall of Famer and Brazilian Jiu-Jitsu practitioner. A legend and pioneer in the sport of mixed martial arts, he is widely considered to be the most influential figure in the history of modern MMA.

Gracie gained fame for his domination in the Ultimate Fighting Championship. He became known for beating opponents much larger than he was, and between 1993 and 1994, he was the tournament winner of UFC 1, UFC 2, UFC 4, and fought to a draw with Ken Shamrock in the championship match in the Superfight at UFC 5. Gracie popularized Brazilian Jiu-Jitsu and revolutionized mixed martial arts with his results contributing to the movement towards grappling and cross-training in the sport.

He holds the most submission victories in UFC history with 11, which he earned between UFC 1 and UFC 4.

Royce is a member of the Gracie family. He is the son of Hélio Gracie (Helio along with his older brother Carlos Gracie are the originators of Gracie Jiu-Jitsu—Modern Brazilian Jiu Jitsu) and spent his childhood in Rio de Janeiro, Brazil. As a toddler, Gracie learned Jiu-Jitsu from his father and his older brothers Rorion, Relson, and Rickson Gracie. He began competing at the age of 8 and by the time he was 16 had attained the level of blue belt.

Jahmal Ara 'Johny' Hendricks (born September 12, 1983) is an American mixed martial artist and an accomplished former collegiate wrestler. He currently fights in the Ultimate Fighting Championship's Welterweight division. As of March 2012, Hendricks is ranked as the #4 welterweight fighter in the world by Sherdog.

While competing for Oklahoma State University, Hendricks won the 2005 and 2006 NCAA Division I wrestling title at 165-pounds, and he finished second in 2007 after falling to Mark Perry from the University of Iowa. The loss to Perry was Hendricks' only one suffered during his senior year at OSU, during which he had compiled a 56-0 record coming into the bout.

In addition to his two national championships, Hendricks was a 4-time All-American at OSU and a three-time Big 12 Conference champion (2005, 2006 & 2007). During his high school wrestling career at Edmond Memorial High School, Hendricks won three Oklahoma state titles and the 160-pound high school national championship.

After graduating from OSU in 2007, Hendricks moved to Las Vegas and signed with Team TakeDown, along with two other former OSU wrestlers, Shane Roller and Jake Rosholt. Hendricks began training for an MMA career and made his professional MMA debut on September 28, 2007, in which he scored a third round TKO (punches) over Victor Ratcliff at Masters of the Cage 16 from Oklahoma City, Oklahoma. Hendricks fought once more in 2007, and defeated Spencer Cowley with a second round TKO (punches) at Snakebite Fight Night from Tulsa, Oklahoma.