Check the listing for details. Melasty, Acrylic Shell for Cow Milking Machines (4 Pcs). Condition: New. Listed at 45.00 USD. Cow Acrylic ShellWhy transparent teat cup shell?1.- Allows you to see the pulsation rhythm in the liners.2.- Allows you to see the pulsation rhythmic that stops moving due to the tear vacuum hose attached to the teat cup3.-Allows you to notice the bending of the liners that may occur.4.-Allows you to see milk leakage that may occur as a result of a puncture in the liner. Specifications:Lenght: 9″Top Hole (Where the teat goes): 1′ 5/8 InchBottom Hole : 1′ 1/16The shell fits the following Melasty liners:a) 3100-51 Rubber Liner Large Size Cow b) 3110-12 Rubber Liner Medium Size Cowc) 3100-2 Rubber Liner Small Size Cowd) 3104-3 Silicone Liner Large Size Cow e) 3110-3 Silicone Liner Medium Size Cow f) 3111-1 Silicone Liner Medium Size Cowg) 3100-5 Silicone Liner Small Size Cow