Primos Tramplifier Open Reed Elk Call Long RangePrimos Tramplifier Open Reed Elk Call Long Range The Long Range Tramplifier Open Reed Elk Call by Primos Hunting; Crafted with premium acrylic for extreme sound projection; Open single reed design for higher pitched calls mimicking cows and calves; Effective in attracting bulls; Easy to use, suitable for hunters of all levels; Produces accurate estrous cow calls; Part of Primos Hunting's product line known for high quality hunting accessories,