Lerni is a Japanese drumstick manufacturer operated by Moridaira Musical Instruments, the Tokyo-based instrument company. Every Lerni stick is shaved, weighed, coated, cut, and polished domestically in Japan, with each piece graded against the brand's internal quality standards before leaving the factory.

The catalog is organized into a Standard Series of lacquered North American hickory sticks offered in roughly seven diameters from 13.5 to 15.3 mm, a Texture Series with an unpainted surface for added grip, a Maple Series aimed at lighter acoustic settings, and a Signature Series developed in collaboration with individual drummers. Models such as the H-140ALW hickory standard, the H-145Rw, and the H-150SHW Shintaro signature stick are among the lines available.

Lerni's signature roster draws largely from the Japanese rock and pop scene, with artist-designed models tied to drummers from acts including King Gnu, 04 Limited Sazabys, Spitz, UVERworld, coldrain, and Hi-STANDARD. The sticks are distributed in Japan through retailers such as Soundhouse, Ishibashi, and Komaki Music, and internationally via the brand's English-language storefront.

Lerni has 4 products cataloged on Equipboard, including Drumsticks, Mallets & Brushes. Their gear is featured by 4 artists, with the strongest followings in Rock, Stage & Screen, and Metal. Notable users include Katsuma, Yu Seki, and Hideki Aoyama.