I'm selling this because I haven't had a chance to use it. This is a CANOPUS bass drum riser for correcting the striking point on small-diameter bass drums. It raises the height of 15" to 18" bass drums, allowing you to adjust the striking point. A wrench key is included. Specifications: ■ Bass drum riser ■ Compatible with 15"-18" diameter drums ■ Width (at the widest point): approx. 12cm ■ Height: approx. 6-8cm (from the floor to the hoop mounting point) I will offer a discount if you purchase this with the snare drum I am also selling. Please send a combined purchase request or leave a comment. Please note that I will not offer discounts on individual items. TAMA, Yamaha, Pearl, DW, Ludwig, Gretsch, Yamaha, Ludwig, Pearl, Canopus, Sonar, Sonor, Signature Snare, Gretsch, Sakae, Drum Hoops, Snare Drum