karli gismu

x1 is a collar/ring/belt/band around/surrounding x2 made of material x3.

Also sphincter. See also sruri, djine.


In notes:

djine
x1 is a ring/annulus/torus/circle [shape/form] of material x2, inside diam. x3, outside diam. x4.
sruri
x1 encircles/encloses/is surrounding x2 in direction(s)/dimension(s)/plane x3.
selkarlygau
g1 collars/has a band put on k2, the collar/band being k1 made of material k3.