I just changed my Gamma Leather grip on my RDX Mid to Yonex Super Leather grip.
The Gamma (trimmed) for the stick weighted about 26gm (in Singapore). Whereas the Super Leather grip weighted about 26gm (un-trimmed), straight from the packet.
My original weight of the RDX with the Gamma Leather is 358gm and now the weight with the Super Leather is 347gm. The difference of 11gm.
Hope this is useful for those who are interested.