They are widely compatible with original common spare parts of TIG torch. In this case, A) as to #10 transparent shield cup for torch WP9/20/25/24, you need to buy one extra O ring to complete the whole spare parts on the basis of original other spare parts. B) as to #12 big or small transparent shield cup for torch WP17/26/18, you need to buy one extra O ring to complete the whole spare parts on the basis of original other spare parts. It has than other ceramic type shield cup because there is no too much Press with heat. Color: green + yellow Material: plastic + metal + glass Package included: 3x #12 glass cup 3x 45Vxx collets body gas lens for tig welding torch 3x 13Nxx collet for tig welding torch 12x o-rings Note: Please avoid to use all kinds of transparent shield cup where there are spatter during welding job. Please do not knock on the transparent shield cup even if it can bear high temperature. Please keep it in mind that all kinds of transparent shield cup needs to be used according the welding range. For DC output welding, the maximum current is 170 A. For AC output welding,the maximum current is 90A. Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. It gives welders an extrodinary visibility and comfortable feeling during the welding job.Especially designed to helps to weld precision and tiny job where it requires to see the location very clearly. Advantage for transparent shield cup: Easy to assemble and use. and practical.Widely used along with our Fortuneweld precision cold welder PCW220.Fits all -9/20/25 series air cooled welding torches. new. glass cup (ID): .15*19.7mm.Stubby gas lens: .2.4 mm Helps to make uniform gas flow for welding which can help welding quality to to high.It can also help to save at least 30% gas comparing to common cup.