Amazon.com: MDF Tweeter Adapter Rings Spacers 2.91" ID x 4.33" OD Car Audio Installation (2 Pairs - 4 Rings) RING-3720 : Electronics
Polk Audio Polk Reserve R900 Height Module Speaker for 3D, Immersive Sound, 1" Pinnacle Ring Tweeter & 4" Turbine Cone Woofer Black Reserve R900 - Best Buy
ScanSpeak Illuminator R3004/6020-00 1" Tweeter Small Ring Radiator
ScanSpeak Discovery R2604/8330 Tweeter Dual Ring Radiator
ScanSpeak R2904/700009 1" Ring Dome Tweeter | HiFiCompass
XV1 25mm Ring Radiator Tweeter set - 12v Electronics
Polk Audio Polk Reserve Series R400 Large Center Channel Loudspeaker, New 1" Pinnacle Ring Tweeter & Dual 6.5" Turbine Cone Woofers Black Reserve R400 - Best Buy
Vine Ring Tweeter Totter - Small Bird Toy - Super Bird Creations
Polk Audio Polk Reserve Series R300 Compact Center Channel Speaker, New 1" Pinnacle Ring Tweeter & Dual 5.25" Turbine Cone Woofers Black Reserve R300 - Best Buy
Phenolic Ring Tweeter for AR, Marantz & More - Speaker Exchange
DS18 PRO-TWRING Tweeter Rings for 120/120B (Black)