The R2S hybrid reactive coverstock works well on many lane conditions, and the inverted Fe3 technology weight block utilizes a larger mass to increase dynamics. Prepped with a 1500-grit polished finish, the Crossroad is sure to skid through even the most hooking heads. 12# Diff 0. 035 RG 2. 65. 13# Diff 0. 045 RG 2. 59. 14# Diff 0. 050 RG 2. 60. 15# Diff 0. 052 RG 2. 56. 16# Diff 0. 055 RG 2. 53. Inverted Fe3 Technology Core. R2S Hybrid Reactive Coverstock. 1500-grit Polished Factory Finish. WWRD 2/7/12