Three are a single braced design while the rest I believe are for double braced stands.
Premier 4000 Series Drum Hardware Pack 4 Piece Excellent Condition Double Braced
Cymbal Stand Premier 4000 Vintage Straight USED! RK4TP260626
Snare Drum Stand Premier 4000 Vintage USED! RKSSP260626
Hi-Hat Cymbal Stand Premier 4000 Vintage USED! RKHVP260626
Gibraltar 4711SC 4000 Series Single Bass Drum Pedal, Chain Drive
Akai 4000 Series Reel to Reel Custom Feet
