This Is what you get.

One each of the Tesla Seal and Apex small seal.

They run from .995" to .1030" plus or minus.

So you get a discount, and I don't hear complaints from around the Globe that the seal is too small or tight. These companies vary tube sizes often and one of these will fit.

For Gamo's in the range, Bam guns like B20-26 and 40, TX 200, SR, Pro Sport and so on.

Details on both seals are listed in this section.

 http://www.airguns.citymax.com/catalog/item/251485/43077.htm