These are 3d printed Concrete bollards typically seen in car parks, supermarket fronts, town centres, and more..... sold in packs of 50.
 
Sold in a choice of 3 different heights, all unpainted in a ABS-Like Grey resin which is really easy to sand, paint and chip with a stanley knife/screwdriver for weathered looks. 
 
All come with a support stick which is perfect for easy painting & easy insertion into your layout without loosing height on the above-ground section of the bollards. 
 
Free royal mail postage
 
These are for OO Gauge, am currently working on O gauge prints which will be out within the next few days