You don't speak to adjustments in difficulty. Does it have a way to vary level of tension or torque? Is that center know used to adjust the difficult?

Hello, thanks for your question! "Self-contained exercise unit with an adjustable tension knob" is part of the description under "Product Features," so yes, the center knob is used to adjust the difficulty. -Fulton Lee, Precise Movements

Color	Silver
Material	Aluminum, Stainless Steel
Brand	Sidewinder
Item Weight	3.7 Pounds
Style	Grip Exerciser
Tension Level	Extra-Heavy
Product Dimensions	4.25"L x 1.88"W
Shape	Cylinder
UPC	796201511772
Manufacturer	Sidewinder
Item Package Dimensions L x W x H	5.8 x 5.4 x 5.3 inches
Package Weight	3.7 Pounds
Item Dimensions LxWxH	4.25 x 1.88 x 0.04 inches
Brand Name	Sidewinder
Part Number	102

Sidewinder Grip Twister

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