Another type is that designed by Allauddin Khan and his brother Ayet Ali Khan. This instrument, referred to by David Trasoff as the 1934 Maihar Prototype, is larger and longer than the conventional instrument, though the fingerboard is identical to the traditional sarod. This instrument has 25 strings in all. These include four main strings, four "jod" strings (tuned to "Ni" or "Dha", "R/r", "G/g" and "Sa" respectively), two "chikari" strings (tuned to "Sa" of the upper octave) and fifteen "tarab" strings. The main strings are tuned to "Ma" ("fa"), "Sa" ("do"), lower "Pa" ("so") and lower "Sa", giving the instrument a range of three octaves. The Maihar sarod lends itself extremely well to the presentation of alap with the four "jod" strings providing a backdrop for the ambiance of the raga. This variant is, however, not conducive to the performance of clean right-hand picking on individual strings. The instrument is typically tuned to C.