I create this for a set of keys which I use for kayaking. The bright style makes it easy to spot when on the beach or in the dark, and it helps the key float if it falls int he water!
The top can unscrew making it customisable with colour options
There's a small groove for a 1mm O-ring in the top to help water seal it
The parts will come chained together by a small web. This reduces the handling costs and lowers overall cost. Just snap the web that holds them together.