139 Rosh Hashanah 3/3-6

(3) The shofar of Rosh Hashanah – is to be from an ibex, [and] straight. Its mouth is to be coated in gold, and there are to be two trumpets, [one] on each side [of it]. The shofar [blast] is to be long and the trumpet [blast] is to be short, since the commandment of the day is with a shofar.

(4) On fast days, [the shofars used] are to be from male [rams, and] bent. Their mouths are to be coated in silver, and two trumpets are to be in the middle [of the shofars]. The shofar [blast] is to be short and the trumpet [blast] is to be long, since the commandment of the day is with trumpets.

(5) The [proceedings on Yom Kippur of the] Jubilee year [are] equivalent to Rosh Hashanah with regard to blowings and blessings. Rabbi Yehuda says, "On Rosh Hashanah – we must blow with those of male [rams], and on the Jubilee – with those of ibexes."

(6) If a shofar was cracked and one glued it, it is unfit. If one glued fragments of shofars, it is [also] unfit. If it was pierced and he sealed [the hole]; if [the hole] impedes the blast, it is unfit, but if not, it is fit.