The Vision 510 Bottom Coil Clearomizer is designed very similarly to the CE3 and CE4 clearomizers, except it is easy to fill and has been scaled down to fit the 510.  Simply pull the top off and drip E-Liquid into the outer chamber to refill, no syringe needed.  Also, since the coil is at the bottom, gravity helps to keep the wick wet, so dry hits are less likely.  Great flavor and vapor production is what this product was designed to provide and it succeeds on both fronts.  Best of all, with this product you will always know exactly how much liquid is left in the tank. 

This product is sold in packs of 5.