Avon Memory Foam Spike Grips For Harley With Dual Cable Throttle Avon Memory Foam Grips softest, most durable, chemical-resistant grip on the market today. A true vibration dampening grip. Features: Softest, most durable grip on the market Ideal for style and comfort and is a true vibration dampening grip Chrome finish with a spike design 1.5 diameter O.d.