420 science is a-ok w/ me. If I'm looking for a product, and they carry it, I'll buy it from them...

They work great. It holds the different parts and attachments I need it to. I also dont have to worry about breaking my glass pieces as much

I don’t have a Grav bong but I bought this clip because I have a bong with a broken down stem but is still functional so I thought this clip could help make my broken piece more secure. It works well and I think it will help prolong the life of my broken bong.