Nymph fly boxes:  Available in two sizes  185 x 100 x 15mm (large) and 135 x 100 x 15mm (small)  Single sided boxes with the self-healing silicon inserts. Note the insert rows are off set to the row above and following which allows each nymph to be easily removed and fly tails and heads are not cluttered and jammed up against each other. Silicon inserts clearly are a way of the future and provide secure and repeated use of slots in your fly box.