Selection guide :
Double enders are typically used with spools,reels, lighthead, wet-notes, backup-mask, etc ... For almost all applications, we would recommend the smaller ones (90 mm). All items that end up in your pocket have no benefit using a bigger one. Also for the lighthead, a smaller is prefered to avoid the lighthead hitting the bottom floor when clipped. For the reel, we prefer a longer double ender (10 mm), mainly because we feel it's easier for clipping and stowing the reel.