The "Standard" size is ideal for students playing Single French Horns. While the "Large" version is best suited to fit Double and Triple French Horns. (The larger design won’t interfere with the fourth valve and assures a secure and comfortable grip).
Standard:Fits most single French horns: 4.8" L x 3.5"–3.8" W (12.19cm x 8.89cm–9.65cm)
Large:Fits most double and triple French horns: 6.3" L x 3.8"–4.5" W (16cm x 9.65cm–11.43cm)