GE Entertainment produced all 4 of these pins. The 2 pins at right are classic stock art done in flat die cut PVC to form the pins. The other 2 are likely enamel, but they feature lesser known poses for Sonic & Tails in the SA1 era. Tails is sleeping on a beach towel, and the Sonic is a little-used art with him doing a trick on a skateboard.
You can see these flat, cut/layered rubber pins on Sonic Pins 1, but the sellers (online only, it seems) never show you the packaging. Well, wonder no more because this is what the card looks like that the pins come on. A nice checker with pale all-blue Sonic line art for the background & simple plastic film. By looking at the texture of the carpet, you can also see about how big they are. (not large at all!) These do feel quality though & the material captures the detail well. Photo & owned by Crystal Sonic Fan May be in the Gear Pin Store