The 100pcs heat shrink ring terminals work for wire gauge AWG 16-14 #10.For motorcycles,automobiles,Tractors,boats,etc.  Live Without Limits:Don't be held back by a humble looking wire connectors.Haisstronica heat shrink connectors are made of tinned copper.The tinning process is designed to effectively prevent copper from being oxidized and reduce resistance.While higher purity copper enhances electrical conductivity.  Unyielding Protection:Unlike cheap,low-quality connectors,these high-quality thick 3:1 heat shrink tubing of heat shrink connectors won't puncture and break when crimping.After heating,the end penetrates enough hot melt adhesive to form a firm seal.Helps retain the wire in the connector much better than just a standard crimp style.  Long-Term Reliability:The brazed seam with exquisite craftsmanship ensures that the wire is not easy to fall off after crimping,  forming a neat and rock-solid crimp.No worries in wire connection!