 			superLayer: @
 			height: @height
 			width: 0
-		
+			borderRadius: 50
+
 		@fill.force2d = true
 		@knob.placeBefore(@fill)
 		

		@knob.draggable.overdrag = false
		@knob.draggable.momentum = true
		@knob.draggable.momentumOptions = 
			friction: 10
			tolerance: 1/10 
		@knob.draggable.bounce = false
		@knob.borderRadius = @knob.width


	constructor: (options={}) ->
		options.backgroundColor ?= "#ccc"
		options.borderRadius ?= 50
		options.clip ?= false
		options.width ?= 300
		options.height ?= 10
		super options
				
