[2] The shape of NGC 6905 is characterised by an internal shell with angular dimensions 47" ×34" and roughly conical extensions, with ansae-type formations along the major axis.

[5] The total mass of gas in NGC 6905 falls between 0.31 M☉ and 0.47 M☉.

[7] The central star has a spectral type of [WO2], meaning it has a spectrum similar to those of Wolf–Rayet stars and is rich in oxygen;[7] it is estimated to have a surface temperature of 150,000 K.[2][8] The spectrum also shows signs of neon emission lines.

[7] An analysis of Gaia data suggests that the central star may be a binary system.

[9] NGC 6905 can be detected under dark skies with a 4-inch telescope, but it is better observed with larger instruments.