Shop Holy Trainer Chastity Device Black Small 50mm (5cm). Free delivery on eligible orders of £20 or more. Having problems with Holy Trainer being a little loose? We can fix that with a Guardian. Our customers love this easy to adjust anti-pullout. The Holy Trainer is an innovative design for chastity play. This piece is made from a strong bio-sourced resin: % natural and % hypoallergenic. It features.