This is the Adaptive Lookback TMA Centered Bands by Mladen. There are a few versions on here posted by members and staff but this particular version is a bit different and includes a few options such as Speed and Deviations choice.
This one also comes with Multi-timeframe + Interpolation, Alerts & Arrows as well.

If you're looking for the other version of the TMA Triangular Moving Average Centered Bands, that one can be found here: TMA Triangular Moving Average Centered Bands for MT4.