Beautiful bow, Kirk. Could you explain what G-10 I beam means?
What is an "I-beam"? The "I-Beam" is typically a piece of material 1/4" or 3/8" thick used in building the riser. This lamination is running from the belly to back direction in the center of the riser.The riser block is laminated together like a sandwich. In some cases thinner materials are used by using an I-beam for strength and additional mass weight in a footed riser, it can be offset so it's hidden & doesnt show in the sight window.
G-10 is short for "G10 FR4 GLASS EPOXY SHEET" It's also referred to as "G-10 Garolite". The material has stronger tensile and compression strength than steel, but can be milled.
I can use this with softer hardwoods and burl woods and still get a non flex riser. I typically recommend it in bows above 60# draw weight. It can be exposed in the riser strike plate area, or offset and hidden when used with a footing. like these bows here. Both of these have a 1/4" G-10 I-beam that is offset for added mass weight, and strength to the riser.
Kirk