ITEM NAME:40Pcs 4 Sizes Solder Sleeve Heat Shrink Tube Wire Terminal Connectors Waterproof Descriptions: 100% brand new and high quality Easy to wire connection, welded, insulated and sealed May be the ideal use in marine and automotive applications Polyolefin pipe on the outside and hot melt adhesive on the inside Welding and seal and advanced with waterproof function Polyolefins heat sinks connectors butt tip better pulling force, Provides seal, strain relief, cable check, and insulation Specifications: Material: Copper Tinned Colors: Red, Blue, White, Yellow Size: 10 x Red : Shrink Connectors: Diameter 3/4 mm, length 40mm, cable cross-section 0.5-1.0 mm ² 15 x Blue Shrink Connectors: Diameter 5/6 mm, length 40mm, cable cross-section 1.0-2.5 mm ² 10 x White Shrink Connectors: Diameter 2/3 mm, length 25mm, cable cross-section 0.3-0.5 mm ² 5 x Yellow Shrink Connectors: Diameter 6/7 mm, length 40mm, cable cross-section 4.0-6.0 mm ² Note: Please allow 1-3mm error due to manual measurement..Polyolefins heat sinks connectors butt tip better pulling force. 1X40 PCS (Four Sizes) Heat Sink Connectors in Bag. Welding and seal and advanced with waterproof function. Easy to wire connection, welded, insulated and sealed.