Foam tubing pieces are 1” approx. 1” long and fit between coax and rubber grommets to keep insects and cold air out of box.  Easily installed and removed.  Can be slit lengthwise to install over cables that already have connectors installed.  Sized for RG8 size coax; can be used on smaller RG8x/RG58 size coax if a few wraps of black tape are used around coax to build up its thickness.