I have mentioned this on another thread but this one "fits" more (so apologies for "double posting")
There is one used on Everything Butt site called the "slink". Lots of depth play to see how deep toys can go.
Here, Casey Calvert gets one deep, deep into Ella Nova.
and here's Roxy Raye using one on herself:
From Squarepegtoys
Small: Height 12″ • Circ 6 1/4″
Medium: Height 16″ • Circ 7 1/2″
Large: Height 21″ • Circ 8 1/2″
XL: Height 20″ • Circ 10″
XXL: Height 24″ • Circ 11″
Fan of: Anal, Gapes, Airtight, DAP, ATOGM, Rough BJ, Gagging, Drool
Go-to girls: Tina Kay, Angie Moon, July Sun, Bree Haze, Olivia Divine, Tiffany Doll, Ria Sunn