The 2, 3, 4, and 5 sized cylinders on the 4010, 4020 and 4110 models were discontinued in Oct. 2009.
They were replaced with the current 4011, 4021 and 4111 which are adjustable sizes 1-5.
The cylinders are also available in a size 6, 4016, 4026 and 4116.
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