These are solid electroconductive rubber rings that snap on to the edge of standard size glass or plastic cupping sets for a perfect fit that doesn't come loose at inopportune moments. Use a little gel for a great suction seal. 

XXL is 5.8 cm   (5 cm = 2 inches)

XL is 5.0 cm

L is 4.2 cm  (same size as available previously)

M is 3.3 cm  (known as small size previously)

S is 2.4 cm

XS is 1.6 cm

Very easy to use, no adapters needed. Just plug in any standard 2mm pin lead to the hole in the squared off portion of the rubber ring. 

Full set comes with one pair of each size for a total of 12 rings.

Order pairs of individual sizes separately. NO CUPS ARE INCLUDED IN THIS LISTING.

*Note- do not use these rings with firecupping, they will melt!*