The propeller covers are made of diving suit neoprene.
Neoprene exhibits good chemical stability and maintains flexibility over a wide temperature range.
This material is shock-proof, insulation, elastic, waterproof and airtight.

Elastic neoprene can suck the propeller, so it will fit different size propellers very well.

Small : 18 - 20" Propeller
Medium : 21 - 24" Propeller
Large : 26 - 29" Propeller
XLarge : 30 - 34" Propeller

Kindly note, colours in stock are as per item description and not sizes as per picture .