Description: Hig quality: Guitar bass Hat Knob is Made of acrylic material. Easy to replace:Top hat volume control knobs, wonderful your electric guitar. Type:Nice look with numbers scale, and easy to install and use. Application:Pedal Control Knobs is suitable for guitar bass replacment.High quality for durable and longing use. Features:Light but hard rigid gear, durable enough to remove and reinstall onto the pots without breaking. Size Chart: Inner:2.4cm/0.94inch Outer:2.62cm/1.03inch Package Includes: 4 Guitar Bass Dome timbre Knobs Note: Please allow slightly errors due to manual measurement and different monitors.