The Replogle Reso Standard “10 1/2” Series Spider-bridge style cone is hand spun in California. Mike Replogle uses a special hardened aluminum alloy for maximum strength, tone, projection and sustain. This is the OEM replacement cone for Dobros manufactured since the late 1960’s and all the way through the Gibson days. Note: The Standard “10 1/2″ spider-style resonator cone measures an actual 10.4375″ net cone diameter. The edges are rolled up to create a bead that reinforces the strength and durability of the cone edges and yields a slightly smaller diameter of 10.4375”. These cones may NOT be trimmed. The Standard “10 1/2″ spider resonator is perfect for some brands that use an actual 10.5” resonator sound well construction.